I grew up with two cats at home, Tinker and Tiger, and my grandparents have always had dogs. So I had the best of both worlds. I would always walk the dogs for my grandparents (a border collie called Flyte and a jack russell/terrier called Baggins) and play with them, my cats on the other hand were just great company and very affectionate.
I am studying here so my schedule changes regularly however I am available on weekends, and most evenings during the week.
I have no real preference towards any breed of dog or cat, I just would prefer a well trained dog.