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An obese pooch has got a new leash of life after shedding the pounds at a 'fat club' - for pets.

Chocolate Labrador Collie cross Monty has shed more than 3kg in the last year to help battle his crippling arthritis, after being put on a strict diet. The 12-year-old dog loved to nick titbits from his owners and tipped the scales at a whopping 38.65kg -- almost most double his ideal weight.