Me: "So, Mrs. Feeder, as I've explained, Tubby's blood panel is totally normal. All three of his physical examinations also have been normal since you became concerned about his decreased appetite and energy level, with the exception that his weight has gone up by over a pound each visit, and now he's obese! You've only owned him for six months! Clearly, he's been eating MORE than enough. He should be eight pounds, yet now he has climbed to TWELVE and a half. Yes, he doesn't play like he used to, because he's carrying half again what he should in body weight."
Mrs. Feeder: "But he just doesn't ever finish his food! I don't think he likes that dry food, so I give him half of one of those little square packages of wet food with half a cup of the dry. But he never finishes! I'm so worried about him. He just doesn't seem to want to eat or play!"
Me: "Well, SEE there? *MY* little dog is TEN pounds, and I only feed her 1/3 of a cup of dry food twice daily, and that's IT. NO treats, NO wet food..."
Feeder (interrupting): "Oh GOODNESS you only feed her TWICE a DAY?! I thought dogs need to eat like us! I feed Tubby four times a day!"
Sigh. How much do you wanna bet Tubby weighs 15 pounds next visit?
PSA: if you try to convince your dog to eat TEN TIMES his caloric needs every day, his appetite JUST might peter out at some point. This is *not*, in fact, inappetence. This is your dog saying "OMG I'm so full I think I'm gonna hurl right now. Puh-LEEEEEZE not to ask me to eat any more, nice lady!"