What age to puppies normally get their adult teeth? Our new puppy is 9 weeks but seems to be chewing constantly. He has rawhide bones when we are there to supervise but he will take anything especially you fingers and he chews on it with his back teeth surely its too early for new teeth.

Hi
As he is just a wee pup its his way of exploring all new things :)
I think different breeds/size have a small difference in time scale for adult teeth to all develop. Mine is a giant and at 8 months he has one tooth left to break through.

I think in general all dogs lose their baby teeth at approx16-20 weeks and this continues till they are about 9-10 months old.Mine is still chewing now and she is nearly 8 months,only chewing roasted bones from the pet store or lumps of concrete she finds in the garden which i'm forever taking off her.They do grow out of it though(hopefully)

Your puppy isn't teething yet, he's just doing normal puppy chewing. Human babies put everything into their mouths too, to explore the world, but later progress to using their hands. Pups don't have hands, so can only use their mouths.
:)