Well, I guess to me he'll always be a puppy, because he practically fell into my hands when he was born (I thought his mom was done already, because there was a very long interval between him and the previous puppy). Apollo is about 2 1/2 years old now, but still not mentally matured. For example, he's just now starting to pee on 3 legs but still reverts to 4 legs. And the adult seriousness isn't quite there yet either. Weight and height I don't know, because I haven't measured for a while. I'll check and post it later.