The PDSA has announced the results of its Pet Fit Club initiative, which has seen 17 portly pets taking a six-month diet and fitness programme with the help of the charity's vets and nurses.
Altogether the participants in the initiative lost a remarkable 86kg (or 13 stone 7lbs) - the equivalent of a mountain of 214 tins of dog food!
Jack, a Cavalier King Charles Spaniel from London who was previously morbidly obese at 20.5kg, shifted 31 per cent of his body weight to weigh 14.1kg.
Elsewhere in the lineup, tom cat Billie from Sunderland lost nearly a quarter of his body weight, becoming a much healthier feline at 6.7kg.
Merlin the border Collie - formerly 111 per cent overweight - dropped 26 per cent of his mass, while even Mini Lop rabbit Bobby fought the fat successfully, losing 29 per cent of her bodyweight.
The PDSA Animal Wellbeing (PAW) Report found over a third (35 per cent) of all dogs in the UK are now overweight or obese, while one in four cats also tick those boxes.
Some 12 million pets are being fed too many fatty treats, putting them at serious risk of heart disease, diabetes, arthritis and lower life expectancy.
Giving their animals healthy dog food and cat food can help owners to battle their bulges while ensuring they stay healthy.