Dog on the picture above might look like she was grown up on steroids but actually this is result of gene mutation. The whippet called Wendy was part of genetic study done in The National Institute of Health in U.S. which reported that the to defective copies of the gene makes dogs look like Arnie. It has been seen before in one human, and also in mice, cattle and sheep, says the study.
This is how normal whippets looks like:
