Purebred dogs are basically just walking Frankensteins. They were created by rich Victorians in the 1800s for aspects such as speed and strength. However, this circle of a bloodline recession made it worse for the animals. It explains why many modern animals have very wrinkly faces and many golden retrievers don't live past the age of 12 due to cancer. I did a project on this awhile back and it's really interesting to read about.
Also the reason we don't have a lot of mummies is because rich people also ate them in the Victorian era.
To make it short: Purebred dogs are the equal of the Charles II of Spain and mummies were the snack that smiles back in the 1800s.