The phrase "dog tails" refers to the fluffy, long, and wagging part of a dog's backside.
Sentences with «dog tails»
First off some colour sorting from Frogs Snails and Puppy Dog Tails in the water table — what a great way to keep cool as well. (rainydaymum.co.uk)
What is the meaning of dog tail wagging? (k9magazine.com)
The research material in this study was 400 dog tail chasing videos collected from You Tube, with no other information on the dogs. (journals.plos.org)