I can understand your situation. My fiance has very different opinions about an animals place than I do. Although he has learned to love my dogs, I don't think he will ever feel nearly the same about animals as I do. It doesn't make them horrible people, just sometimes people are hard to change.

In this situation, calling animal control is as good as anything. Even if you stay there keeping an eye on the animal to be sure animal control could find it. Don't feel bad about it.