The PDSA charity says a large number of pet owners in Wales and across the UK aren't feeding their animals the right diet.
The organisation warns that a poor diet combined with a lack of exercise could lead to reduced life expectancy in a pet.
Pet obesity poses not only major health risks such as diabetes, arthritis and heart disease, but sadly also means daily misery for millions of pets who are feeling the strain from carrying too much weight.
More top news
Wet and windy weather for the rest of this weekend but next week will be drier and brighter.
John Henry Williams is the most decorated Welsh NCO of all time.
UKIP's Assembly leader has been speaking at the party's conference in Birmingham this weekend. He said he wants to scrap the Welsh Assembly.