DNA research of dog breeds
It makes sense that a lot of small dogs share DNA with pugs. Pugs were often bred with larger dogs to produce smaller versions. When they get more breeds into this research, it might be worth getting my dog tested to see what the heck she is.
Ignore the incorrect title to the link
The title should be:
Where did your dog come from? New tree of breeds may hold the answer.
http://www.sciencemag.org/news/2017/04/where-did-your-dog-come-new-tree-breeds-may-hold-answer