I have a ten and a half week old lab. I am new to dog training, so i bought a couple book and read them. But they do not have much info on puppy training. I have started treat training with sit, kennel, heal, come, and down all is going very well with that, but my pup is not very enthusiastic about retrieving. I know he is young, but i keep the retrieves to 1-3 at a time. Sometimes he will do well for the 2-3 throws, so i put the bumper up. Other times on the first throw he will plop down and start chewing on the bumper and when i call him he comes but leaves the bumper. So i put it up. I have tried paint rollers and puppy bumpers. He loves wings and i just introduced him to birds and he was very enthusiastic about them. Should i be concerned? Should i only play fetch with him one time a day for now? Does anybody have any recomendations?