We used to take in rescue Dobermans and a couple of rescue cats, at the same time. They got along so well that when we went on vacation and boarded them, one cat, Zabo, stayed with his best buddy Kurt, while Warlock stayed with his best buddy, our feeble minded Hilda, who was a huge, picture perfect Dobe..but with not too much smarts. The vet was horrified and made me put the cats in with the dogs myself and just stood there, shaking his head. In fact, Zabo was more savage towards strangers than the dogs were!!! Our nice vet wound up with a knee-jerk reaction to black cats just because of Zabo!!
Yes, dogs and cats CAN get along, sometimes better than humans.