Nearly half of dogs are overweight and most owners cannot see it. How to check, why cutting the normal food in half is the wrong fix, and what works over the months it takes.
Check first
Overweight begins at 10% above ideal weight, obese at 20%. Feel for the ribs under gentle pressure; if you cannot, the dog is carrying too much. The figure check and the 10% rule. Your vet can give a body condition score and rule out thyroid and adrenal causes.
Why halving the bowl fails
Cutting the normal food in half cuts the protein, vitamins and minerals in half too, and leaves a hungry dog that begs and scavenges. A weight-loss food is lower in energy but higher in protein and fibre, so the portion stays full, muscle is kept, and the dog feels fed.
The plan
Weigh, do not scoop
Feed to the target weight, not the current one, in grams on a kitchen scale.
Treats out, or out of the ration
Treats are the easiest calories to remove. Use pieces of the daily ration for training, or a low-calorie care snack counted in.
More activity, gradually
Longer and more frequent walks, built up slowly in a dog carrying a lot.
Weigh in every one to two weeks
Aim for 1 to 2% of body weight a week. That means months, not weeks, and the check-ins are what keep it going. A 2015 study found the diet is on average cost-neutral once scraps stop.
After neutering
Metabolism and behaviour change straight away; feeding usually does not. The two years after neutering are the highest-risk window for weight gain, so switch to a lighter recipe or reduce the ration at the time, and weigh monthly.