The critters and I struck a deal when we moved into this place 40 years ago; and it is thus: If you are a wasp, venomous spider or venomous snake, stay out of my house, yard, garden and shop and you will be OK. Come into any of the forbidden areas and you are dead meat if I catch you. Other critters...like racoons, possums and deer are welcome (some...like skunks...are only tolerated) as long as you behave yourself. If you are a squirrel, don't cut my tomatoes. If you are a gopher, there is zero tolerance.
A few years back, my little Boston Terrier was bitten by a Copperhead in our back yard. He was one sick little puppy, but he survived. He stayed overnight at the Vet's, but looked like he had a really bad tooth; his jaw was swelled for several days. I keep my yard trimmed and mowed, so we really don't have a problem with snakes of any kind.