How does your dog get along with other pets in your home?

My friend had a huge great dane, and they later also got a pet bird. The dog would freak out if you went over to see the bird. I couldn't tell if it was being protective of the bird or just really jealous of it, but the dog wanted your sole attention - and would start pulling on your pant leg until you got away from the bird cage.

We have two cats now, but when someone is my family is baby sitting someone else's dog, they will bring them by the house to visit. The cats freak out and stay hidden. It's almost comical. The dogs will want to play with them and the cats will be up on the book shelf acting like "oh hell no..."