1. Meet Diesel the boxer. He's four years old, he's from Poole, and his favourite food is Custard Cream biscuits. He's also double the weight he should be. PDSA Diesel is one of 17 obese pets trying to lose weight on PDSA's Pet Fit Club, the animal charity's annual slimming competition. It involves a six-month programme of tailored eating and exercise plans overseen by PDSA vets and nurses. Here are the other competitors (and their snacks of choice). 2. Snowball is a two-year-old Dwarf Lop rabbit. His love of treats led him to be 35% overweight. PDSA 3. Bruce hates exercise but loves Weetabix with goat's milk and honey. He is 60% overweight. PDSA 4. Oscar the sprocker spaniel has already lost some weight, but has plateaued at 51% overweight. PDSA 5. Zorro's twin passions in life are crisps and napping. Zorro is my spirit animal. However he is 88% overweight. PDSA 6. Somehow, Barney's trick of eating newspaper has led to him being 75% overweight. PDSA 7. Joey the rabbit demands apples by clanging his bowl against his cage bars. He's 28% overweight. PDSA 8. Alfie, who loves chewing on pig ears, is 109% overweight. PDSA 9. Dave the cat weighs in at 58% overweight. Dave likes to steal his sister's food. I like Dave. PDSA 10. This is Zed, whose abiding love of cake has pushed him up to 114% overweight. PDSA 11. Poppy, tellingly, likes popcorn. She's 32% overweight. PDSA 12. Ty is 60% overweight thanks to his giant food portions. PDSA 13. Tom's canny ability to open food cupboards has led to him being 96% overweight. PDSA 14. And Jack Russell Max is 70% overweight. That's mostly biscuits. PDSA 15. And Daisy is over 40% overweight - thanks to a steady diet of cheese and broccoli. PDSA Pet Fit Club can work - last year's winner, a Jack Russell named Ruby, lost over a stone during the six month stint. View this video on YouTube youtube.com Keep an eye on these pets' progress, and find out more about the PDSA's Pet Fit Club.