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Poisonous snakes and dogs:  We are all familiar with situations where a dog happens to bite another dog or even a human.  These occurrences are always scary.  For me, the most heart-stimulating bite cases are the ones where the headline might read “Dog Bites Vet”.  So no matter who you are... man or animal... the effects of a venomous snake bite can be extremely painful and disfiguring.  Venomous snakes kill many dogs, cats and people every year.

Did you know that each year in the United States, over one million animal-bite wounds are reported? Dogs and cats inflict the vast majority.  On occasion the tables get turned on our canine friends though, and without warning they are recoiling from the pain inflicted by sharp, poison-injecting fangs.  Caught off guard, it is a moment you will never forget if you and your dog encounter a poisonous snake while simply taking a pleasant walk in the outdoors.

Snakebites are a fact of life for dogs and humans in a wide area of North America. Venomous snakes bite about 8,000 people annually in the USA, but according to most estimates, only 12 to 15 of these bites are fatal.  You won’t find details on the numbers of dogs bitten, or killed, by venomous snakes, though.  I asked Michael Schaer, DVM, Professor of Veterinary Internal Medicine at the University of Florida, College of Veterinary Medicine, about the numbers of dogs bitten or killed by snakes in the USA. He responded  “I don't believe we have a valid source of information on the actual numbers of dogs bitten or killed by snakes annually in the United States because there is no central data resource for this.”  In his twenty-two years as the lead clinician handling snake bites at the veterinary school, Dr. Schaer estimates about a 20 percent fatality rate for dogs bitten by the Eastern Diamondback and the Eastern Coral snakes.

Although there surely are isolated areas of the United States where venomous snakes are not plentiful, their range spreads all across the country with only Alaska and Hawaii reporting no species of the poisonous kind. Many cases of snakebite occur in dogs that are “just visiting” a part of the country where poisonous snakes are plentiful.  It has happened that dog owners who reside in an area devoid of poisonous snakes are shocked into reality when visiting an area where venomous snakes reside! 

 TYPES OF POISONOUS SNAKES

The Unites States has fifteen species of rattlesnakes; two kinds of water moccasins, the copperhead and cottonmouth; and two kinds of coral snakes.  The six types described here make a good representation of the venomous snakes present in the USA.

Fortunately, if your dog happens to be bitten by a poisonous snake the odds are in favor of a complete recovery.  The degree of damage inflicted by a venomous snake is determined by a wide variety of variables.  The age and species of snake, the intensity and depth of the fang penetration, the amount of venom injected, the location of the bite, and the size of the dog are just a few of the variables.  In general, snakes want to be left alone. But along comes an inquisitive dog probing every mysterious hole in the ground, sniffing under downed logs, slogging along the riverbank, and digging up leafy patches on the forest floor... and a lightening strike of the serpentine kind may be the result!

WHAT SHOULD YOU DO in the event a snake bites your dog?
First, let me tell you what not to do.  Do not take out your pocketknife and cut Xs over the fang marks!  Do not attempt to suck venom through those X marks.  Do not grab the snake in a fit of anger and attempt to choke it to death.  You may be bitten yourself.

PLEASE DO...
*  Try to identify the snake by taking note of its size, color patterns and the presence or absence of a rattle at the end of the tail.
*  Look the dog over carefully for fang marks, noting that there may be more than one bite wound.
*  If bitten on a leg, wrap a constricting band on the affected limb snugly at a level just above the bite wound (on the body side of the wound).  This band could be fashioned of a shirtsleeve or other fabric and should be snug but not excessively tight.  The compression around the limb will slow the spread of the venom.  The dog may lose the limb but that is better than losing his life.
*  Start your journey to the nearest animal hospital while trying to keep the dog as quiet as possible.

PREVENTING SNAKE BITES
*  While out walking, controlling your dog with a leash may be your best safety device.
*  Do not allow your dog to explore holes in the ground or dig under logs, flat rocks or planks.
*  Stay on open paths where there is an opportunity for snakes to be visible.
*  Keep nighttime walks to a minimum; rattlers are nocturnal most of the year.
*  If you hear a rattlesnake, keep your dog at your side until you locate the snake; then move away.
*  Off-trail hiking with an unleashed dog may stir up a snake and you may be as likely a victim as your dog.
*  If your dog seems unusually curious about “something” hidden in the grass, back off immediately until you know what it is.

WHAT IS VENOM?
Venom is a toxic fluid created in specialized oral glands related to salivary glands, and the toxic component is composed of an array of complex proteins. Every snake’s venom contains more than one toxin, and in combination the toxins have a more potent effect than the sum of their individual effects.  Most of the toxic effects are due to the enzymes in the venom and there have been about twenty-five enzymes discovered so far. Venoms are of two types, either neurotoxic (affecting the nervous system) or hemotoxic (affecting the blood and vessels).  The venom of many snakes contain both neurotoxic and hemotoxic components.

SNAKE BITE KITS
Should dog owners carry antivenin kits with them routinely while outside with their dogs?  Probably not says Dr. Schaer. “An antivenin kit probably wouldn't be that practical because of expense, routes of administration and other important reasons.”  Most antivenin products are targeted for a particular species of snake and may have no effect on the snake that bites your dog.  Antivenin may not have a long shelf life and due to expense, most animal hospitals so not keep a supply on hand.

Vigilance and keeping control of your dog when walking in areas inhabited by poisonous snakes will be your best deterrent to a snake encounter.  It’s not a bad idea to memorize your veterinarian’s emergency phone number, too!