In our area the snake most likely to bite a dog is the
Copperhead.
But the good news is that the
Copperhead is the least venomous of all the viper snakes in Texas, and a
healthy dog is very likely to recover from a bite in short order.
Check with your local vet, who will usually
recommend simply administering Benedryl (an anti-histamine) to control
swelling and perhaps an antibiotic for possible infection.
Benadryl Dosage For Dogs:
The usual dosage for treating dogs is 1 mg/lb every 8 hours (three times
daily) but can be doubled to 2mg/lb if needed.
Example:
If your dog weighs 25 lbs, you would administer 25 mg (one regular
strength pill) of diphenhydramine up to three times daily.
For liquid dosage, use the Children’s
Liquid Benadryl formulation, which is alcohol free. At standard concentration, every 5 mL
(or 5 cc) of liquid contains
12.5 mg of diphenhydramine and can be given to dogs at a dosage of 0.4
mL/lb. For reference a US teaspoon measurement is 5 mL.
Example:
If your dog weighs 25 lbs, you would administer 10mL (10cc or 2 tsp) up to three times daily.
(The suggested dosage is for Benadryl with the active ingredient
"diphenhydramine". Make sure the formulation you’re using contains either
"diphenhydramine" or "cetirizine" as the only active
ingredient before giving it to your pet. For small pets use the
Children's Benedryl for more accurate measuring)
http://www.veterinaryplace.com/dog-medicine/benadryl/