we livein country and with dogs 'running' we don't put collars on them as we don't want them to get hung up anywhere. And we sure don't want pet doors as we do get raccoons, possums, and lately armadillos--which I just HATE. Ugh!
Also, I have a friend with a pet door that also lives in the country and she's had snakes in the house--and thinks it's through the pet door! Yikes!