It is normal. They start losing teeth at varios ages, rough play and chewing may cause teeth to fall out prematurely. Most not all start somewhere in the 3-4 month range.
The molars are usually some of the last to come out so most of the other teeth are probably already be adult teeth.
Especially with the smaller teeth you don't always notice them popping out. So your pup snuck off and grew up on you when you weren't looking.
The adult teeth should be showing where the baby ones fell out and if not should pop up soon.
Most are done teething between 6-8 months.
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Last edited by Patch-O-Pits; 09-10-2008 at 12:09 PM.