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.
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Wales have qualified for the Euro 2016 quarter finals after beating Northern Ireland 1-0 in Paris.
A rally has been held in Cardiff following the EU referendum to show support to migrant communities.
It's 0-0 at half time in Paris as Wales face Northern Ireland in the last 16 of Euro 2016.