A deformed Boston Terrier

I'm in a big box pet store to buy a Boston Terrier. I tell the clerk I better look at the dog before committing to buy it. The clerk brings the dog out and it doesn't look like a Boston, but I like it. The dog jumps on me and licks me a bit. As it walks further from me I notice it is grotesquely obese belly but has a pencil-thin chest and see3ms thin like a sunfish. I'm glad I said I wanted to look at the dog before buying it.