Hey, I'm new on here, and was wondering if anyone had any ideas about what kind of dog I may have. I found him about 7 months ago. He has more energy than I've ever seen in a dog, I am 5'2 and can hold a toy right above my head and he can jump and reach it, I think that he could also run around the back yard for hours if I didn't stop him. He's about 28 pounds right now, and comes up to about my knee. The vet said he's probably abou 2 years old. Any ideas??