Little dogs don't really fit into my lifestyle so no I only have medium and large dogs.....however if I were ever to have a little dog I would find it a hard choice between a Border Terrier, Cavalier King Charles or a Miniature Pinscher - they're all pretty cute breeds of doggies I think.
Hmm, well I have 2 purebreds right now and one mutt (Springer X collie) and all of them are healthy and happy. I've probably had an equal amount of both purebreds and crossbreeds over the years and they've all been as healthy as each other.
I did have a Springer X collie rescue dog who died from cancer at about the same time as both of my neighbours purebred collies also died from cancer. My dog was 6 years old and the neighbours dogs were brothers and were both 3 years old.