My girls have learned to leave the cat alone, pretty much, after scarring has occurred. Gemma though, keeps trying to get her to play - she makes noises and goes down in front of the cat, who of course, hisses and swats her a good one - she has more fur than Shaye, so she has some protection, but I swear sometimes that cat eggs her on, lying right next to her favorite toys, etc., so Gemma can't get to them. It's funny to watch.
Ask the breeder how big the sire and dam are. That's a good idea. My first basenji, who was a champion, weighed nearly 26 pounds when she matured. My 2nd one would have been about that, but thanks to steroids, we did good to keep her at 30. My current rescue is a giant. We won't go there. I first dreamed of a SMALL dog, maybe 15 pounds tops after years of being a BIG DOG person (rottweilers and chows). I don't see that ever happening.