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Formula K, Britain’s first weight-loss dog food, has released a free DVD showing you how to tell if your dog is overweight.

The DVD also gives advice on how to get your dog's weight down.

In the DVD, vet Sarah Hill examines four dogs, including Formula K founder Kit Sadgrove’s Labrador retriever, Clifford. After checking, she pronounces many of them overweight.

The DVD is online at


Want to know whether a dog is overweight? Here’s what to do:

1. Looking from on top, see if there’s a narrowing at the dog’s waist. No narrowing means he could be overweight.

2. From the side, look for a tuck behind the last rib. No tuck could mean your dog is overweight.

3. Feel for the dog’s...

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