Also proof eugenics don’t work. I have a Labrador retriever and mixed breed that has multiple types of terrier and some sort of Argentine mastiff knockoff. Looks like a stereotypical “pit”, but according to the test the shelter did is like 7 breeds mixed.
The retriever has never once chased a thrown object. It’s supposed to be in the name lol. The so called “dangerous fighting dog” loves nothing more than bringing back thrown objects all day if able.