Giant breed adult dog food
A giant breed — think Great Dane, Mastiff, St Bernard, Irish Wolfhound — is a different feeding proposition from a merely large dog. These breeds often keep developing skeletally until 18–24 months, well past when most dogs are considered adult, and once mature they eat a genuinely large volume of food daily, which makes storage, cost per month and portion consistency practical concerns as much as which recipe to choose.
The long transition into adulthood
Many giant breeds are still developing structurally at an age when a medium breed has been an adult for the best part of a year, so moving onto an adult food too early can outpace what a still-maturing giant-breed skeleton needs. Follow your specific food's age guidance for giant breeds rather than assuming a general "large breed" cut-off of around 15 months applies equally.
This is a feeding-stage decision rather than a medical one to make alone — if you are unsure whether your individual dog has finished growing, your vet can advise based on their actual development rather than breed averages.
Feeding volume in practice
An adult giant breed can eat several times what a medium-sized dog does daily, which means storage matters: a large sealed bin keeps a big bag fresher for longer than leaving an open sack in a cupboard, and buying a larger bag size is usually more economical per kilogram for a dog eating this much.
Splitting the daily total into two meals rather than one large meal is standard advice across deep-chested giant breeds, partly for comfort and partly because a very large single meal is one of several factors linked to a higher risk of bloat in deep-chested dogs — a genuine emergency that needs a vet immediately if it happens, not something to manage at home.
Joint support as a standard consideration
The sheer frame size of a giant breed puts more lifetime load through hips, elbows and spine than a smaller dog carries, which is why many giant-breed-specific formulas include joint-support ingredients like glucosamine as standard rather than as an optional extra.
Keeping a giant breed at a lean, appropriate weight matters more here than for almost any other size category, since every extra kilogram is extra load on joints that are already working hard simply supporting the dog's own frame.
Sized for this dog
Everything below is in stock with us, priced with delivery worked out, and packed and posted by hand in the UK.
Forthglade Soft Bite Grain Free Joints & Bones Treats
Grain-free salmon dog treats with salmon oil, glucosamine and chondroitin
£2.45
Pooch & Mutt Salmon Oil
Scottish salmon oil for dogs, dosed by weight from toy breeds to giants
£13.99
Forthglade Cold Pressed Natural Turkey
Cold-pressed turkey kibble for dogs from 2 months, soft enough to mix with water for young pups
£45.99
Forthglade Cold Pressed Grain Free Salmon
Cold-pressed grain-free dry food for dogs, built on fresh and dried salmon
From£16.99
Forthglade Cold Pressed Grain Free Duck
Cold-pressed grain-free duck food with fruit and botanicals, in two bag sizes
From£16.99
Forthglade Cold Pressed Grain Free Chicken
Cold-pressed grain-free chicken food with fruit and botanicals, in three bag sizes
From£16.99
Forthglade Complete Meal Lightly Baked Turkey
A lightly baked complete dry food, 50% turkey, for adult dogs of any breed
From£12.49
Forthglade Complete Meal Lightly Baked Chicken
A grain-free complete dry food for adult dogs, lightly baked and built on 50% chicken
From£12.49
Forthglade Cold Pressed Small Dog Turkey
Cold-pressed grain-free dry food for small dogs and puppies, built on turkey
£16.99
Forthglade Complete Meal Lightly Baked Lamb
A lightly baked complete dry food, 50% lamb, for adult dogs of any breed
From£12.49
Forthglade Cold Pressed Grain Free Turkey
Grain-free cold-pressed turkey kibble for dogs, gentle on sensitive stomachs
£69.69
Forthglade British Classics Chicken Family Lunch
Complete Forthglade wet dog food with 75% chicken in a 395G tray
£2.45
Common questions
- How long do giant breeds take to reach adulthood?
- Many giant breeds continue developing skeletally until around 18 to 24 months, considerably longer than smaller breeds. Follow the age guidance on a food specifically formulated for giant breeds rather than a general large-breed timeline.
- Why do giant breeds need two meals a day rather than one?
- Splitting the daily amount into two smaller meals is standard advice for deep-chested giant breeds, since a single very large meal is one of several factors associated with a higher bloat risk in these breeds. Bloat is a genuine emergency requiring immediate vet attention, not something to treat at home.
- Do giant breeds need more joint support than large breeds?
- Many giant-breed foods include joint-support ingredients like glucosamine as standard, reflecting the extra lifetime load their size puts on joints. Whether an individual dog needs additional support is worth discussing with your vet, particularly as they age.
- How much food does a giant breed dog eat in a month?
- It varies by the specific dog and food, but giant breeds typically eat considerably more per month than medium or large dogs, which makes buying larger bags and storing them properly in a sealed container worthwhile both for cost and freshness.
Written by Matt Garnett, who runs Giddy Pets and is a lifelong pet owner — not a vet. This is general information, not veterinary advice, and it cannot replace an examination by the vet who knows your animal. How we write these guides.