My almost 2 year old yellow lab has been very lazy when it comes to fetching the bumpers. I'm worried that she might have lost some of her drive that she had last year during training and hunting season. Anyone have any advice as to how to bring her drive back? I've considered getting some live chuckers with the wings tied to chase around to bring her drive back. Any advice is appreciated, has anyone else dealt with this? Could it be just the heat and being in the AC during the day?