I know about this. If I were not so ignorant of this program and busy, I would show you some pictures. I think there is a contest, and I could write a hub, but I am busy in the real world, and have obligations that I am ignoring as we speak.
It depends on factors and individuals, not breed. There is a general rule . . . mutts attract. Example: Republicans hate Obama. My family line is a tangle. I am a registered Independent. I don't care for either party or their power machines. On a personal level, I like Pres. Obama and his personality. So what if he bowed. It was bad advice from his advisers. At least the little people overseas liked it. Everyone thought GW Bush was an idiot in his flight suit. That too was bad advice, "Here George, wear this and be a hero."
Anyway, animals are the same. Mutts aren't arrogant about their breed. Mits are different, but that is another hub.
The pet owner, the age and temperament of the pets all factor in. If you own a young Boxer, Dalmatian, Jack Russel, or Pit Bull, spare the cat. There are exceptions, but the cat will always be damp. Puppies and kittens mix well. You can add ducks, chickens, parrots, ferrets, Guinea pigs, and more to the list. If the animals are young enough they, "imprint" on each other as being in the same brood. Breed is no longer a factor. Once either species has grown up with the other, they are cool from then on.
I would not experiment with full grown animals, unless they have been raised around another species, and their good friend has bit the dust. The replacement will be the only one who needs to adjust. In that case, do not introduce a full grown animal. It will be like putting a Democrat or Republican in with an Independent. The independent will be open to the new arrangement, but the others will be locked in endless contention.