A 30-pound feline thought to be Britain's fattest cat is entering a pet fitness competition in an attempt to lose weight, his owner said.

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Jan Mitchell, 68, of Dorchester, England, said her Norwegian Forest cat, Ulric, is one of 21 overweight pets being put on a strict diet and exercise regimen for six months by a veterinary charity, the People's Dispensary for Sick Animals, the New York Daily News reported Friday.

"He just kept getting bigger and bigger and when he hit the two stones [28 pound] mark that's when the alarm bells started ringing," Mitchell said.

The PDSA said Ulric is the fattest cat ever to participate in their program.