I have a 14 month old yellow Labrador mix, Hailey. She is hyperactive. Not just normal "happy active puppy" hyper, but full blown, unable to stop, obsessive hyperactive. We have a huge fenced yard (about a half acre for her space)and she runs constantly all day. She never tries to get out -and I know she could. She has a log pile the length of the fence, and she uses that as her perch, to sit up high and see everything. She could step right over, but she is content to stay in her yard. Everytime a car passes, she runs back and forth from one side of the yard to the other, about 3-6 laps per car. She bashes into the fence on one side, then runs to peek under the fence through a hole she dug on the other side. When she runs past, its a blur, and you can almost feel the ground shake - she's fast! In the winter she chases cars. In the spring & summer, she chases birds. She leaps like a deer and attempts to fly. When the birds get wise to her, she switches to flies, or other insects. On a slow day, I blow bubbles for her. Overall, the dog is hilarious. She knows it too. She loves to make me laugh. But the problem is, she is so thin, and she keeps getting thinner. All her ribs are showing. I feed her the recommended amount for her breed/age. She usually eats it all eventually. But I swear she is so obsessed with watching for cars and running laps, she can't be bothered to take time out to eat. Anyone else ever had this problem? It seems like she must burn off more than she eats. Maybe a change in food?