Some people go by maturity rates: around two years is when most consider a puppy to be a dog. Some consider them to leave the puppy stage when they hit a year, since, for whatever reason, a year is signifigant to them.
If I wanted to get technical about it, I'd say that a dog is no longer a puppy when he is fully trained for his profession, be it a showdog, a pet, or a working dog. But that's not to say the dog won't be puppy-like at certain times. I know of a protection dog who rolls around in the grass with a 3 and 6 year old like he was still a 5 month old little pup. I have an elderly husky who I recently retired...he gets extremely excited when he sees a harness and has no problems running and playing with the other dogs. Other than his tad bit of extra weight and wise old eyes, you'd think he were 1-2 years old still.
It could also depend what you mean by adult. Are you asking about sexual maturity? Breeds and individuals mature at different rates. It can go by a lot of things, not just breed alone. Thought, it seems like you just mean in a general sense.
yes... I just mean it in general.....like human 18 is the age to be considered adults. But then I guess it is a really difficult question to answer, just like us human you can be old age wise but young at heart.
tiger lily is approaching a year old, but she still acts like a puppy. i think in dogs, same as people, they each develope at their own pace. some remain puppy-like well into their elder years. i have met some people that i can apply that too also. lol
Basenjis aren't considered fully-matured adults 'til age 3, although they're pretty much at their max height/weight at a year old, with just some filling out to do. Guess it takes them another two years to mentally mature...LOL!.
My boy just turned three, and I can say that I feel he's grown up, mentally and physically, now.
***Edited By: gbroxon on 11/29/2006 7:40:04 PM*** Reason: Add.