Big Wendy the muscular whippet

Look at the picture of this dog, Wendy the whippet.

The dog has a double mutation for myostatin protein. [link]

Wendy was recently part of a genetics study done in the U.S. on mutation in the myostatin gene in whippets, which resemble greyhounds in appearance. The National Institute of Health study reported that whippets with one single defective copy of the gene have increased muscle mass that can enhance racing performance in the breed, known for speeds up to 60 kilometres an hour.

But whippets with two mutated copies of the gene become "double-muscled," like Wendy. It has been seen before in one human, and also in mice, cattle and sheep, says the study.

p.s. Myostatin blocker bodybuilding supplements are a fraud.