Recently, we've had two younger Bullies come through our rescue. One, Lala, we kept and the other, Missy, we placed. Lala has been nothing short of a delight...came in a 6 months with a broken leg and got surgery to fix it and simply stole our hearts. Nothing out of the ordinary with her from day one...except some potty issues if she is in the kennel longer than she should be. IOW, she gives no effort to try to hold her poops overnight. If we sleep in 1/2 hour more than usual we get "gifts". That's probably on us more than her.
Missy was a different story. As soon as she's out of the kennel she's non-stop all day long, running around, playing chewy face, on the furniture, carrying on...did I mention NON STOP? While she was with us the only way to get her to settle down was to sit on the floor and roll her over on her back and rub her belly. Once righted, she's into something. She spent a lot of time in the kennel. I'm not convinced that this was toddler behavior but it sure seemed like it. She's approaching 1 year old and we're told she has yet to slow down. I'm thinking she never will...which is great for the family she's adopted. They are always on the go and they love her immensely.
"like a box of chocolates..."
I would go in expecting nothing and when you get something, be delighted. It's usually funny.