Length n height have some impact on weight.
But some dogs are naturally slender, with a greyhound-type look.
I have a Maltese (purebred-btw) who is tall & weighs 9 lbs. I had a silky who was much smaller/shorter but weighed 1/2 a pound more. He simply has a higher muscle ratio.
A cat that looks bigger than my late Maltese, but both weigh 5 lbs.(Sorry, weighed in the case of the dog.) Again, muscle mass is deceptively small looking.
My Tibetan ter. is thin according what I have read...
But everything has variences. |