i have a 4 month old yellow lab male. Listens well is crate trained, have been noticing lately a lack of fire or drive to retrieve. He did well with hallway retrieves when he was younger and only threw a couple at a time to keep his interest. He will retrieve bumpers in the yard somedays like a pro and then other days just doesnt care. Try to throw bumpers at a different location, wants nothing to do with it too distracted. I guess my concern is that he just doent have much fire, for the breeding he came out of i was expecting a big powered dog. Ny ideas how i can increase his drive and fire??