Buster will be two years old in two months and weighs 3.8 lbs. He is very small and very cute. He does not have any more health issues than my Yorkie that weighs 5 lbs. He can jump up and down from the furniture. He will jump in the car when we are going somewhere. He loves to walk, run and swim. All in all he is pretty healthy. He looks fragile and I am very careful with him. I wouldn't trade him for anything. He is very sweet and loving and so very, very loyal.