Sami's dog Kirby has a BAD tendency to want to chase and play with cats. And moving here with two cats, I was a bit worried about it. So, for the first day, I let the cats wander all of the house with Kirby outside on the balcony, and then I would put them in the bathroom and let Kirby wander around. I did this for about a day and a half so that they knew each other's scents.
Then, when letting them meet, we put Kirby on a leash and let the kitties loose. He would try and go after them and would be yanked back (sometimes with a pop on the head, too--but he's a big dog that doesn't respond to verbal commands when excited and I don't think you'd have to go that far with your little babies
). If he would dare to stick his face close to Gerona, I would LET her slap him. Kirby had to learn that the cats were NOT his toys and he couldn't chase them.
So, I think that if Layla is going to be staying there for sometime, it would be EASIER for you if you go through the stress/trouble of getting the dogs and the kitty used to each other. Break their meetings up into sessions, and if you are leaving the house, do like I did and lock the kitty up somewhere safe (bathroom for me). If you are afraid Layla will hurt Chaquita, don't let him get TOO close to her (have a leash handy
). Maybe a hiss and growl might be enough to scare him?
Good luck and keep us updated on Layla coming to see you!