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| INDEX OF ARTICLES | WAITING ROOM | EXAM ROOM | SURGERY ROOM | X-RAY ROOM | GENERAL TOPICS | IMPORTANT TOPICS | LAB and PHARMACY | PET PHOTOS | PET SUPPLIES | PET PHARMACY |
Pet Nutrition Principles
by T.
J. Dunn, Jr. DVM
Pet nutrition principles for feeding dogs and cats continue to evolve. An example of how far we've come concerns what we veterinarians, 30 years ago, used to call "All Meat Dogs." These pathetically sick and dying dogs were coming in to clinics all over the United States, thin, weak, with hair loss and metabolic imbalances as a direct result of eating a nationally advertised "All Meat" canned dog food. Nearly everyone at that time thought that because dogs were carnivores (they're technically omnivores) that "all meat" diets must be the best thing for them! We know now that dogs cannot survive if fed 100% meat for extended periods.
Since then, that pet food manufacturer's knowledge has changed and they now make some properly formulated foods. We've all learned much more about just what it takes to put together the right combination of ingredients in the proper ratios to create a nutritious diet.
Unfortunately for the pet food purchaser, and worse for the dog, there are available all across the United States various brands of foods that, despite what the label may claim, are NOT a good source of nutrition for your dog. Some are actually harmful!During my thirty years of veterinary practice I
have often been upset by the poor condition I see some of my canine patients in
due to inferior quality diets that the owner honestly believes to be adequate.
In good faith the dog owner assumes that since
the dog food label proclaims
"complete and balanced", "premium", "high
protein", and so on, that their dog will automatically do just great if
that's all it is fed. Because of ambiguous or deceptive labeling of the dog
food, the owner unknowingly will feed an inadequate diet. And it may be decades
before the FDA requires more strict guidelines for dog food manufacturers to
follow so that misleading, ambiguous, and sometimes phony labeling practices no
longer confuse or trick the purchaser.
For example, I could put together a "high protein" dog food where the protein is composed of an indigestible substance such as feathers, hide or hoofs. Sure, the protein level by analysis might be high (and even the experts don't agree as to just what amount qualifies as "high" protein level in a food) but if the dog's gastrointestinal tract is unable to break the protein molecules down into amino acids and then absorb and utilize those amino acids, the diet is worthless as a food source for the dog! So "high protein" on the label means absolutely nothing; you've got to read the ingredients label to see if the source of protein is digestible. See Table #1 to compare the approximate digestibility of the more common dog food ingredients. Egg white protein is used as the benchmark, giving it a value of one (1) since it is so highly digestible. Other protein sources are then compared to egg whites regarding their digestibility.
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Table #1 - PROTEIN DIGESTIBILITY LIST |
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| Egg whites | 1.00 |
| Muscle meats (chicken, beef, lamb) | .92 |
| Organ meats (kidney, liver, heart) | .90 |
| Milk, cheese | .89 |
| Fish | .75 |
| Soy | .75 |
| Rice | .72 |
| Oats | .66 |
| Yeast | .63 |
| Wheat | .60 |
| Corn | .54 |
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(Note: Values in table are approximate, as they have been taken from several nutrition sources and personal communications with nutrition experts.) |
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It's a good idea to explore the dog food label to see if the statement of its suitability is documented either by analysis or through feeding trials as specified by AAFCO (Association of American Feed Control Officials). You should have much greater confidence in the diet's nutritional value if feeding trials on live dogs have been done as opposed to the diet having been designed on paper only and, therefore, formulated by analysis.
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Did you know that even if the dog food label says
that the ingredients are X, Y, Z that there may not be any X or Y or Z in the
food at all? How could this happen? The practice of substitution of one or more
ingredients is a greater possibility if you buy that food from a small local
mill or if the food is of a generic variety. Generally, the larger manufacturers
have set ingredient parameters that don't vary. This is called a fixed formula.
On the other hand, some pet food producers will substitute ingredients and not
change the label to truthfully reflect what you're buying. Price and
availability of raw ingredients change
from day to day, the less ethical
producer will then substitute one ingredient for another in order to keep
production costs to a minimum. They want to make that food as cheaply as
possible! And changing the label to reflect the ingredient change is not
required to be done immediately.
Did you know that some of the most popular and most trusted brands of dog foods are purposely formulated to just meet the minimum requirements of an average dog? These formulations are set up so that the pet food can be sold at a targeted lower price in order to appeal to the consumer group that will not spend higher amounts on dog food. A dog food that just barely meets the minimum nutritional requirements of a dog will have cheaper ingredients, such as grains, instead of higher quality ingredients that cost more. And meeting the minimum standards for an average dog means statistically some dogs won't get what they need. What if your puppy or adult dog isn't average? No one has ever shown me what an average dog looks like so how am I, after working with tens of thousands of dogs over thirty years of practice, supposed to know the difference between an average dog and one that isn't? How will you know if your dog is average? And even if you did know, would you really want to feed it a food that was specifically designed to only meet it's minimum requirements? Buy a cheap dog food and you will be feeding your dog cheap ingredients. Cheap ingredients are less efficiently digested, there's more fecal waste production, and the dog won't be as healthy as when fed higher quality (meat-based) dog food.
Another example of how poorly regulated the pet food industry is concerns preservatives. There are all kinds of agents used to keep the nutritional value in that bag or can of dog food from deteriorating over time. The AAFCO (Association of American Feed Control Officials) Official Publication lists 36 preservatives, some having no restrictions on amounts that can be mixed with the food. Chemicals such as Ethoxyquin and BHA (butylated hydroxyanisole) have controversial reputations as to safety. Most experts will tell us they are safe, however, many pet owners would rather avoid chemical preservatives and instead use substances that don't have murky reputations. Currently, pet food consumers have driven the popularity of more "natural" preservatives such as Vitamin E or Vitamin C.
So naturally, (pun intended) we consumers, when given a choice, generally pick a food preserved with Vitamin E and have every reason to expect that the food has no other preservatives in it. Well, sorry. It still could have other chemical preservatives in the food if the manufacturer purchased the fat and protein from suppliers who, prior to shipping to the manufacturers, added chemical preservatives. So the food manufacturer's label says, "preserved with Vitamin E" because that's all they added. You have no way of knowing if prior to what the manufacturer did, someone else added other preservatives. This pet food industry really needs tighter controls and more specific labeling of their products. In the meantime, you might be asking, "How do I pick out a good food for my dog?" There are some general rules to follow and concepts to keep in mind when choosing a good dog food.
Choosing A Good Dog or Cat Food
Making the right choice starts with reading the
label's list of Ingredients. By law the ingredients must be listed according to weight
of the ingredient added in descending order. In other words, by weight of raw
ingredient the main ingredient is listed first, second most
prominent ingredient next, and so on. The first three ingredients are the most
important. It's easy to tell if the diet is vegetable based, with corn, rice,
wheat, and soybean meal listed as the main ingredients; or if the diet is meat
based, with meat, lamb, fish or poultry listed as the main ingredients.
I would always pick a meat-based diet over
vegetable-based foods for optimum health for dogs. Now...here's the catch! I'm
going to have to pay more for the meat based diet! Responsible and caring dog
owners should never let the price of the food dictate the purchase decision. In
almost every situation... with dog food, you get what you pay for. The higher the
price the higher the quality. I'll let you consider the converse of that. And
the higher the quality of the ingredients, the greater the nutritive value for
the dog. Plus, you will purchase less high quality food than cheap food since
dogs must eat more low quality
food to meet their nutritional needs.
Immediately you will notice that when feeding a high quality, meat-based food,
the dog will need to consume fewer cups of it per day than a cheap diet; the dog
will also pass noticeably less stool when consuming a high quality diet than
with a grain-based diet.
Cheap dog foods - and they are widely available and wrapped in all sorts of fancy labels - will contain cheap ingredients that will be poorly digested and will lead, over varying lengths of time, to deficiencies in your dog's health. Stroll through the pet food departments of various pet food outlets and read the labels of the different products. The cheap food will almost always be vegetable based and the more costly foods will be meat, poultry or fish based. Your dog has no control over your choice; so you have an obligation to provide good quality products that will optimize your dog's quality of life! And don't forget to pay attention to the trick of "ingredient splitting." What the pet food manufacturer does, in order to make the ingredient list look better, is to break down a product such as corn into its different forms, then place each form of the ingredient into the ingredient list according to the amount of the form present. For example, they will list ground corn, yellow corn meal, corn gluten, and corn gluten meal separately and thereby split up "corn" (which really should be listed as the main ingredient) in to places further down on the ingredient list to make it appear to the consumer that there is less corn in the dog food. See the difference between meat-based diets and grain-based diets here.
What Is The Guaranteed Analysis?
This listing, required on dog food labels, is
intended to instill confidence in the product's contents; however, it only gives
you a percent approximation of what you are buying. It indicates maximum or
minimum amounts of the substance in the food. For example, if Crude Fiber is
listed as "Not less than l0%", you have no idea how much over 10% is
actually in the diet; or if Crude Fat "Not less than 15%" is listed,
does the diet contain 16% or 36%? So the Guaranteed Analysis helps, but not
much.
Should I Feed Canned or Dry...or Both?
If dog owners had to choose one or the other,
canned food or dry food, they should choose the dry. Canned food is generally 75% water,
so 75% of your purchase price is going toward a non-nutritive ingredient that you can
readily obtain from your own water faucet. Plus, there is an advantage to oral
hygiene in the friction of the dry dog food, helping to keep the gums and teeth
healthier than if the dog were eating only canned food. The only time I
recommend canned food is to someone who refuses to stop buying cheap dry food;
the addition of canned food to a cheap dry food will generally improve the total
diet. And just like the dry food, canned food has an ingredient list you can
read to help guide your purchase decision. A dog being fed a high quality dry
food does not require any canned food.
Semi-Moist Foods
I never recommend semi-moist foods. You know the
ones... they're wrapped in cellophane and look like meat and have names that give
the impression they're meaty. I often wonder why the manufacturers, if they want
to associate these foods with meat,
don't put any meat in them! They do put lots
of food coloring, soybean meal, sucrose and preservatives like propylene glycol
in them though! Forget about the semi-moist dog foods.
Table Scraps
Many of my clients, when I query them about what they feed their dog, will proudly offer this statement, "...
but we never feed
table scraps!" And I respond, "Why not?" Dogs can be
fed many foods that people eat, but there are exceptions such as the fact that
some dogs are lactose intolerant, grapes on occasion can cause
kidney damage,
and overfeeding certain foods can create nutritional imbalances. You, at home, could feed your dog a perfectly fine diet if you knew
the right amounts of meats, vegetables, fruit, etc. to feed and in the proper
ratios. But why bother when there are good diets already prepared for you by
companies employing highly knowledgeable scientists with years of research
backing them up?
Table scraps are perfectly acceptable to give to most dogs under certain conditions. And it is better to feed them to the dog than throw good food in the garbage. But you must remember that sudden changes in some dog's diet may promote diarrhea, vomiting and in the instance of providing too much fat all of a sudden, pancreatitis. Most dogs eat more consistently, are less finicky, and are less likely to have digestive tract upsets if they are fed consistently every day. If you choose to feed table scraps, try to do it on a fairly consistent basis.
I am not a proponent of feeding bones to
dogs. For one thing there is almost no food value in bones (although there
is plenty of good nutrition in the attached muscle and fat). Don't believe
me? Take a look for yourself at this
page to see just how little food value there is in bones. I've actually had clients brag to me how their dog
"Eats 'em right up." As dogs chew on them, animal
bones are apt to
splinter and if the dog swallows them, the dog may get into a situation
requiring surgery to save its life. I have surgically removed bones and bone
fragments from dog's anatomy ranging from bones caught between the upper molars
in the mouth to razor-like fragments from a lacerated rectum. Many dogs have
died as a direct result of eating bones; if you feed your dog any kind of animal
bones, you're asking for trouble. There's very little nutritive value, they are
NOT quickly digested by stomach acids, and there are infinitely better ways to
keep your dog's teeth clean! For more info about this controversial topic,
see some actual
cases of bone obstruction.
Here are a few notes relative to "table scraps" or "people food":
Dogs do not get worms from drinking milk! Loose stool is fairly common, though, due to the dog's inability to break down lactose which is milk sugar.
Dogs do not get worms from eating candy. Chocolate, because it contains a caffeine-like chemical called theobromine, in large amounts can cause heart problems and other potentially dangerous effects.
Garlic is not an effective de-worming substance; there are much more effective wormers available. Scientific studies have recently proven that neither yeast nor garlic will repel fleas.
Spaying (ovariohysterectomy) female and neutering (castrating) male dogs does not cause them to "get fat". In healthy dogs that are overweight the only reason they are overweight is that they are consuming more calories than they are burning up. Simply put...somebody's feeding the dog too much! See this about pet weight loss.
"Hard bones are okay to feed,
but never soft ones like chicken or turkey bones." FORGET IT! NO bones of any kind,
ever, if you want to avoid the chance of
obstructive digestive tract
disorders.
Dogs manufacture their own Vitamin C internally so it is not required in the diet. You can safely give dogs Vitamin C, but please don't believe all the stories about it curing hip dysplasia, arthritis, cancer, fleas, mange, cataracts, diabetes, allergies, etc. Dogs under stress of intense exercise, disease or aging may benefit from some supplementation.
Vitamin/mineral supplements for 99.9% of dogs are not required if the dog is on a high quality diet. Extra calcium given to large breeds of dogs on a good diet will do harm. It is incorrect to give extra calcium just because "it's growing up so fast."
Dogs frequently develop allergies to corn, wheat, soy and other foods. Allergies are manifested usually by dry, itchy skin; reddened, swollen ears; itchy face and chin; compulsive licking of the paws. (Caution! These signs also are present when a dog has Sarcoptic Mites so these parasites must be considered in any dog that seems to have a food allergy.) Vomiting and or diarrhea may result if the dog develops food intolerances. Food allergies and intolerances can be a challenge for the veterinarian to properly diagnose.
Dietary deficiencies may take months to develop. I've seen dogs eating poor diets where it took 6 months before deficiencies became evident. Start feeding a high quality diet and you will see improvement in three weeks.
Many types of dermatological problems are avoided if the dog or cat is consuming an optimum diet. In some cases, adding a supplement such as DermCaps, a popular Omega Fatty Acid supplement with a number of beneficial ingredients, is the key factor in avoiding repeated episodes of Hot Spots and other skin afflictions. If your dog or cat seems to lack good coat and skin health, consider upgrading the diet to a meat-based ingredient formula and adding a supplement such as DermCaps.
How Much To Feed
Every bag of dog food will give a suggested
amount to feed relative to your dog's weight or breed. I'll give you a helpful
hint... don't even bother to look at these suggestions. They'll only confuse you
since they are imprecise and vague. Keep in mind that every dog is unique (no
wonder I can't find an "average" dog!) in it's metabolic rate (how
fast it burns up calories) and nutritional requirements. Whether you feed
"free choice" by keeping some food in the bowl all the time or
"restricted" or "portion controlled" by feeding a certain amount once or twice a day, the very
best way to judge if you are feeding the right amount is to look at the dog. If
it appears too thin for its breed (remember, some breeds such as Setters and
sight-hounds are normally "thin") then feed the dog more food. If the
dog or puppy appears overweight, cut back on the amount fed.
Most dogs, probably 75%, if fed "free choice" will maintain optimum weight. The rest will become overweight and you, having complete control over what your dog consumes, will have to restrict the total amount of food intake to get that overweight dog back to a weight where it appears normal. See this about pet weight loss.
So the amount to feed varies with every dog. For example, you could have two dogs, each weighing 40 pounds, where one might require twice as much food as the other to maintain its weight at 40 pounds. So don't look at the food label to tell you how much to feed, look at the dog!
Brand Suggestions
It is difficult to actually name certain brands
to feed because every manufacturer seems to have a wide variation in ingredient
formulations. For example, Purina makes some excellent dry foods, such as
Pro Plan Chicken and Rice, and also produces a few kinds of foods that barely
meet minimum daily requirements and probably shouldn't even be called "dog
food". You need to pick a name brand such as Purina, Eukanuba, Iams, etc. Then look at the ingredient list on the prospective type of
food you think your dog will need. I am
not a fan of "Reducing" diets because they rarely work and usually
deprive the dog of essential fats. The key to weight reduction is to feed
a high quality, meat-based diet... but regulate the amount you feed to
get the needed weight loss. Never put a cat on a reducing diet without
consulting with your veterinarian.
If you would really like to get into the nuts and
bolts of dog nutrition, the best publication containing extensive data on all
aspects of the topic is the Official Publication of the Association of American
Feed Control Officials. This 350 page paperback book can be purchased by writing
to Treasurer, AAFCO, Georgia Department of Agriculture, Capitol Square, Atlanta,
GA 30334. Phone # (404) 656-3637. An excellent text book that is
easy to understand is CANINE AND FELINE NUTRITION by Case, Carey and
Hirakawa. It is published by Mosby-Year Book, Inc.
Future Concepts
Strange to say but I believe we dog lovers will
be going back to the future in properly feeding our canine friends. Going
back to Nature by feeding meat-based foods and including what we term
"table scraps" in dogs' diets will surely be an improvement over some
of the grain-based, cheap pet foods available today. Raw diets, frozen
meat diets such as are made by Animal
Food Services of Green Bay, Wisconsin, and home made diets are here today
and will be even more popular in the future because dog owners will see the
excellent results these more natural diets achieve. This is NOT to say
that commercial canned and dry foods are not good for dogs and cats,
either. I have personally examined 20 year old dogs and cats that we never
fed table scraps but were fed only a brand name dry or canned food. There
will always be a deserved place for commercial dry and canned pet foods; I just
hope that the high quality ones are most utilized.
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For a report on the Nutritional Value of Bones, read this. |
In Summary
Use common sense. Read the labels. If you do
those two things, you will certainly avoid the cheap, plant-based dog foods with
the fancy labels that try to make you think you're getting a good deal.
Remember...your dog's health, more than any other
single aspect, depends upon optimum nutrition.
More topics on Nutrition
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