My Aussie puppy is 17 weeks old and already weighs 40lbs. The vet says he’s 100% hearty healthy. This still seems to be much larger than any other 17 week old Aussie I’ve ever seen. He is AKC registered but recently I’ve seen pictures of Aussie-Bernese mountain dog mixes that look suspiciously like adult versions of my Groot. Is this a possible over sight or do I just have a big boy.