I have 4 cats.
Some cats get along and some don't. Surprisingly my Ragdoll is the least friendly of them all. She loves me, the dogs and the youngest cat but she is mean to other people and the other 2 cats.
My 2 oldest cats are buddies, they hate the dogs and dislike my Ragdoll cat, Monster.
My 2 youngest cats are partners in crime, they love dogs and usually beat up the older ones, although only one is truly playing.
Honestly, I wouldn't risk bringing in another cat at this time. I think it's best to get littermates or 2 kittens at the same time. You never know, you might bring another cat in and cause world war 3!
Sinister "The Prince of Darkness" 4 yr old black male GSD 3.11.09
Draco "Dakota's Unbreakable Vow" 5.5 mth old male Dalmatian 6.30.13
Cats: Chaos, Mayhem, Monster, Wicked