I have a Common Snapping Turtle and two cats. We also have five chickens, but they are more like egg-producing garbage disposals than pets - I try not to get too attached to them.
We had a Border Collie/Cattle Dog mix named Rex when I was a kid. He was the smartest dog I've ever known, and I grew up around dozens of dogs (my mom breeds Great Pyrenees and used to run the local Dog 4H club).