Marie, we have 14 cats and 5 dogs. Not much disturbs our balance! LOL! But, in all fairness, our animals are used to us bringing home strays, new fosters, dumpoffs, etc. As long as you show your existing pets that you still love them, give them separate attention, your guys should be fine. Our cats don't even raise an eyebrow any more when a new cat shows up. Cody will usually walk up to the new comer and wash their face. That usually does it, the new foster/rescue has a buddy to curl up with. The other cats will not start anything, they just ignore the new cat.

Since getting the puppy though, we have only rescued 1 cat/kitten. I was unsure what Poohbear would do with the kitten, but he is quite gentle with it, unlike his wrestling with Cody and Buddy, who you would swear is WWIII.

I would pick a pup with a complimentary attitude to Daisy, if she tends to be a little hyper, pick out a laid back breed, and a male, to help insure no alpha bitch fights. You do NOT want one of those.

Good luck with your decision!