This cartoonish muscle-dog is Wendy, a whippet with a genetic disorder causing ridiculous muscular growth.
While Wendy's condition is sure to have many medical applications to various muscle development disorders, we're still hoping Disney casts her as the bad guy in Air Bud 4.
http://www.cracked.com/article_16556_15-images-you-wont-believe-arent-photoshopped.html#ixzz1bKkYtMea