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The majority of my puppies started teething (lost a tooth) at around 4 months. Some a little earlier and some a little later than that and the period of time it took from the first tooth to the last was approximately two months. I started showing all of them as 6 to 9 puppies and they all had adult teeth by that time.
Generally puppies will lose the upper and lower incisors first (the ones between the canines). Then they lose the premolars (the ones behind the canines and in front of the very back teeth which are molars). Once they lose the molars they finally lose the canines. An occasional dog with deviate from the pattern but commonly that's the sequence.
And don't ever think they are through chewing because all the adult teeth are in--there follows for anywhere from a couple of months to as long as a year a process called setting the teeth--the puppies will chew, avidly, on everything--the deck, the furniture, the corners of the house, sticks, woodwork etc and they are literally setting those new teeth into the boney structure of the jaw.
Most puppies do more chewing AFTER they have their adult set of teeth than they did while they were teething.
Couldn't even tell you if it's worse for puppies than kids--I don't remember and I've been around kids who didn't seem to do much more that grow another tooth without any problems and some who ran fevers, cried incesantly and did seem to have a hard time.
I had one puppy who lost his first tooth at four months and two days and who lost the last canine incisor at 5 months and 4 days. He lost teeth in batches--all of his upper incisors in one day--he ran a temperature for 18 hours, didn't want to eat and slept all the time--30 hours after the first tooth he had a whole new set of upper incisors. He did the same thing with the lower incisors. When he started losing premolars he lost all of the upper AND lower premolars in about 24 hours and went through the elevated temperature, no eating and sleeping deal for almost 48 hours and you could see the tops of all of the premolars at that point and he was back to normal. He's the only puppy I've ever had that lost teeth like that--I think his mouth was a lot sorer just because he lost so many teeth at the same time but he got it all over with in a big hurry.
He looked a lot like a a dog wearing dentures that were a whole lot too big for him for a couple of months.