Do some dog breeds really have slower metabolisms than others?

Yes, within normal biological ranges. Beyond the allometric size effect (smaller dogs burn more per kilogram), some breeds have been selectively bred in ways that influence energy balance — Labrador Retrievers, for example, carry a POMC gene variant linked to reduced satiety signalling, which effectively means they feel hunger more readily. This is not the same as a clinically slow metabolism, but it does make weight management harder than in breeds without this tendency.

My dog is gaining weight but I have not changed their food. Why?

The most common reasons are: age-related decline in metabolic rate (older dogs need fewer calories even with the same routine), reduced activity that has gone partially unnoticed, increased treat intake (including chews, dental sticks, and scraps), or a change that occurred after spaying or neutering. Recalculating your dog's calorie target at their current age and activity level is the right first step.

Is it true that feeding once a day increases a dog's metabolism compared to twice a day?

Meal frequency has a modest effect on digestive energy expenditure (the thermic effect of food), but the difference is small and unlikely to produce meaningful changes in weight over time. For most dogs, twice-daily feeding is recommended by veterinary organisations for reasons of digestive comfort and blood sugar stability, not metabolic rate manipulation.

How do I know if my dog has hypothyroidism affecting their metabolism?

Hypothyroidism in dogs — a genuine medical cause of reduced metabolic rate — typically presents with weight gain alongside other signs: lethargy, cold intolerance, skin and coat changes, and sometimes a slowed heart rate. If you are concerned, a blood test measuring thyroid hormone levels (T4) is a straightforward, reliable diagnostic tool your vet can arrange.

Understanding Dog Metabolism | PetCalculator

Why does one dog gain weight on a portion that keeps another dog lean? Canine metabolism is shaped by breed, age, reproductive status, and muscle mass — and understanding how these factors interact helps you feed your dog more precisely.