The main suggestion I have is to start young.. that way they are still small enough they dont get away as easily cuz your still stronger. I just bought the doggie toothpaste and started out with just a little on my finger to let them lick it off. They all decided they like the flavor of it so that helps. Right now all 3 are good for the brushing of the outside of the teeth(the showing part when they smile) but when you have to get the insides of the teeth none of them really are happy with that. Maggie is the best at sitting for it, Alex tolerates it and JoJo fights ya (but we've only had her 2 1/2 mths) one thing I've also found is put one thumb inbetween their uppper and lower teeth when trying to do the insides of the teeth, cuz when they try to close their mouths and feel your thumb they stop cuz they dont want to bite you. (obviously only do this with a dog you really know & trust)
Good Luck...
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Shawn....
Maggie, JoJo, Alex, & Destiny too