How do Ты brush a dog's teeth?

either with a tooth brush, или Ты can use special toys that are good for teeth, like Nylabones.

what kind of dog?

I did try to brush my dog's teeth with a normal toothbrush and toothpaste once. Never again. My dog would'nt sit still. She kept swallowing the toothpaste and wriggling. So i gave up but keep a check on them regularly.

My mum used to brush my old dog's teeth with a human toothbrush. I think...

Sure do, never when he was a puppy, it was only as he got older, but now ever since I started to brush them, His breath stinks!!

A toothbrush