You may want to add birds of prey such as hawks and owls who are capable of picking up a cat or small breed dog and killing it with their talons immediately and then flying away with their meal.
Also add humans who let their animals run loose to get run over by cars, poisoned on purpose or accidentally.
Asked my vet about what to do when one of my dogs gets bit by a snake, he said DMSO will help draw the toxins out. I have used it on myself with fire ant bites and other insect bits and it keeps them from forming a pus pocket. Might want to ask your vet about it.
Anything can happen, and everyone who has a pet should think about what they would do in an emergency situation.answers.yahoo.com/.../index