ANY snakebite is considered an emergency – no matter the size of the snake or your pet!
Symptoms of a snakebite include puncture wounds, swelling, redness, pain, blisters, bleeding, panting or other difficulty breathing, crying, whimpering, convulsions, and many other changes in behaviors that should immediately cause concern.
Do not try to cut the bite wound open or suck out the poison! Seek veterinary care immediately for proper treatment of the bite and any secondary problems.
Read more at: Mountain Aire Veterinary Hospital: Rattlesnake Bite Prevention