Most owners have blinkers on when it comes to their animal companion and are unable to discern if they are getting just a little bit too podgy.
So, it is little surprise that the growing pet obesity epidemic has spurred one pet clinic in the US to educate owners about the serious health risks to overweight pets.
Dr Ralph Pratt from West Greenwich Animal Hospital, said: "More than half of all pets are overweight or obese. Even worse, nearly half of all pet owners believe their pets are a healthy weight - despite the fact that they are overweight or obese."
The medical expert explained that heavy pets are a product of owners feeding them too much, not enough exercise and unhealthy treats.
Dr Pratt also recommends that treats are rationed for special occasions only.