This is a clip from “DogTown: The Road Home” on National Geographic, which you probably saw on Friday night if you’re a depressing loser who prefers animals to science fiction shows. It’s about Tuli, an overweight chihuahua/pug mix that looks like — and I’m quoting the video here — “a fruit bat that swallowed a pineapple.” (Funny, I thought your mom was the only one who could swallow a pineapple.) The whole thing is pretty adorable and funny until the preachy lesson about canine obesity starts around the 2:15 mark. Then it becomes this depressing montage of fat dogs. If those dogs were people they’d totally shop at Wal-Mart.