Well for the past month or so Cujo's been a lil lethargic, I mean, he'll play n stuff, but he doesn't have his old balls to the wall hauling ass around the house when I chase him type energy, I don't know why, I thought maybe because he's maturing now that he's almost 2 n is just calming down. Then I got a puppy added to the mix n it all got worse, he turned into Captain Lazy, didn't really care to play fetch properly either. But I know the first few weeks of adding a puppy can cause a dog to act in a way that is out of character for him... but tonight for the first time he's really started to just be the way he used to be, mischevious, mouthy, running around at top speed when chased, really wanting to play, jumping over furniture, being able to rough house n roll on the ground with him n everything. He's his old puppy self again! So I'm happy now, because I was worried that thru maturity and some of the training we've done with him may have made him forget how to play... but I've been doing lots of playing and prey work with him recently n just letting him enjoy everything with no corrections, walk him on a flat collar n let him pull n jump over park benches n stuff etc. So maybe that's helped him return to his usual self.