The purebreed of the future!
Through a highly selective process, the perfect breed of dog is finally within reach. Unfortunately.... his eyes are too big for his head, and thus he cannot actually see very well and is prone to glaucoma early on in life. And his head is too big for his body, so he falls over a bit. His legs are pretty spindly and apt to break. No tail, so he might have uncontrollable bowel issues.. His tongue is also much too big for his head, so it droops out a little. His ears are petite but he can't hear much. His face is kinda smooshed too, so he might have nasal complications. I don't think I need to mention how fast his nails grow as a result of some of the other mutation effects.
BUT ISN'T HE DARLING. WOULDN'T YOU LOVE TO BE SEEN CARRYING A CUTE LITTLE POOCHIE SUCH AS HE!?!?