We have two dogs - a four year old male and a 2 year old female, same breed and roughly same size.
We've had the 2 year old for a few weeks now. So far the two dogs are getting along well. They play a lot and they've only been in a few fights that were mostly our fault for not paying enough attention.
Recently, the male dog started grabbing the female's tail, while they are running chasing each other. He uses her tail to bring her to the ground. When the female goes down, she still does not show signs that he doesn't want to play, but we are wondering if this should be acceptable behavior. I have never heard of dogs biting another dog's tail while running/chasing and using it to bring the other dog down. I recorded a video of that here in the first few seconds.
If it's not good to allow a dog to do this, how can we train the male to stop?