One cat, one dog.
I love them each in a special way. Touch is like no other cat, because he put the touch on my heart.
Music is so precious I named her Music because she is music to the soul.
I have never seen Touch dislike an animal until Music the puppy arrived. That was the first time in 15 years he ever acted catty. Then I knew the depth of his character--he is one.
Music was not to be outdone. Her precious and sweet love-the-world aura becomes one of lip-biting jealousy around Touch, except she knows I will not like it if she kills the cat, so she doesn't.
My husband thinks you should have only one cat and only one dog. Otherwise, he thinks your pet will be very sad if you have another dog if it's a dog, or likewise, if you parse your time between cats.
Most of the time it's ok, but it can amount to a Mexican Standoff at times in their world. Maybe both of them think they are human and that causes the air to jiggle.
Who knows.