Best food for a Bull Mastiff

Choosing the right dog food is genuinely complicated — the right answer depends on your dog's age, size, breed, and health, and the most expensive or most heavily marketed options are not always the best fit. You mentioned a Bull Mastiff, which is exactly the kind of breed where getting the balance right really matters: they're naturally heavy and muscular, and you want to support that lean mass without piling on fat. To help properly, can you tell me how old your dog is, whether there are any health issues or sensitivities I should know about, and what you're currently feeding them?

Good — 58kg at two years old for a male Bull Mastiff is within range but definitely on the heavier end, so you're right to think carefully here. The main challenge with this breed is that they need high-quality protein to maintain that muscle mass, but they don't need a high-calorie, high-fat food that keeps adding weight. A lot of mid-range kibbles bulk things out with cheap carbs, which doesn't serve a dog like this. Can I ask — is he active? Daily walks, off-lead exercise? And is the current kibble one you'd recognise the ingredients on, or is it more of a supermarket brand?

That's a really common situation, and the good news is there's clear room for improvement here. Supermarket own-brands almost always rely on cereal and grain fillers as the primary ingredient — that keeps costs down but means your dog is getting less actual meat protein per gram of food, and more low-quality calories. For a Bull Mastiff at this size and life stage, you want something with a genuinely high meat content, moderate fat, and controlled calories — not a working-dog performance food, which would be too calorie-dense. My recommendation is Orijen Original dry dog food. It's around 85% meat content, uses whole prey ratios, and has a strong protein-to-calorie ratio without being loaded with fat. The ingredient list is exactly what a dog like yours needs: real named proteins, no filler grains, no vague 'meat derivatives.' It's available on Amazon UK in larger bags which brings the cost down per day. For a 58kg dog you'd be feeding roughly 450–500g daily, so a 6kg bag lasts about two weeks — less than it sounds when you account for what you're actually getting.

It's a fair concern and worth addressing directly. Orijen is protein-rich, not calorie-rich in the way a high-fat food is — the calories come from meat rather than from added fats or carbs, which means they're used more efficiently by a muscular dog. That said, if he's already on the heavier side, you'd want to start at the lower end of the feeding guidelines and adjust based on weight over a few weeks rather than just following the bag exactly. The transition should be gradual too — ten days mixing old and new food — because a rich food introduced too quickly can cause loose stools, especially if he's been on a grain-heavy diet. Weigh him monthly for the first couple of months and adjust portions accordingly. If after six weeks on the correct portion he's still gaining rather than stabilising, there is a leaner option — Orijen Fit and Trim — which is designed specifically for dogs that need protein maintained but calories dialled back. But I'd start with Original and see how he responds.

That's exactly the right approach. Slow transition, start at the lower end of portions, and weigh him every few weeks so you can see the trend before it becomes a problem. Bull Mastiffs can be prone to joint stress at higher weights, so getting him to a lean but muscular condition is genuinely worth the effort. If you have any questions once you've started the switch, come back and I can help you troubleshoot.