If you suspect your pet is overweight, he probably is.
I found this handy tool while perusing the Association for Pet Obesity Prevention website.
Did you know that a 12 lb. Yorkie is the same as a 5'4" woman who weighs 216 lbs? Kind of gives you perspective, doesn't it?
How about this? A 14 lb. cat is the same as a 5'9" man who is 237 lbs.
Check out this page and use this handy Pet Weight Translator.