Quick answer
Companion dogs do best on a complete-and-balanced diet matched to life stage — usually quality commercial wet, dry, or fresh food. They are opportunistic omnivores with scavenging ancestry, not obligate carnivores like cats. Measure portions, keep toxic human foods locked away, and treat raw feeding as a veterinary risk discussion.
Omnivore and scavenger ancestry
Dogs descend from wolves but are not dietary clones of wolves. Domestication alongside human settlements favoured animals that could thrive on scraps — meat, bones, starch-rich leftovers, and whatever else camps provided. Genetic research has shown dogs carry more copies of the AMY2B starch-digestion gene than wolves, supporting better use of dietary carbohydrates.
That history explains why balanced commercial foods can include grains or grain-free starches successfully for many dogs — and why “feed like a wild wolf” marketing oversimplifies companion nutrition. Modern pets live longer sedentary lives; their bowls need complete nutrient profiles, not romantic reenactments of the hunt.
Key takeaway
Think scavenging omnivore adapted to people, then feed a complete modern diet — not unlimited leftovers and not an unsupervised raw carcass plan.
Complete commercial diets
For most households, a reputable commercial food labelled complete and balanced for the right life stage is the safest default. Look for clear feeding directions, named nutrient adequacy statements, and manufacturers that employ veterinary nutritionists and run quality control. Boutique claims and influencer recipes are not substitutes for formulation science.
Treats should stay roughly under 10% of daily calories so the main diet still delivers vitamins and minerals. When medical conditions appear — kidney disease, food allergies, pancreatitis — prescription diets under veterinary guidance often outperform generic “sensitive” labels.
| Format | Strength | Watch-outs |
|---|---|---|
| Dry kibble | Convenient, shelf-stable | Helpful for dental abrasion in some dogs; measure portions |
| Wet / canned | Higher moisture | Useful for picky eaters and dogs needing more water intake |
| Fresh / gently cooked commercial | Higher cost | Choose complete-and-balanced formulas with feeding trials where possible |
| Home-cooked | Full owner control | Needs veterinary nutritionist formulation — DIY gaps are common |
| Raw (BARF / prey-model) | Controversial | Pathogen and nutritional imbalance risks — see risks section |
Wet vs dry food
Dry kibble wins on cost, storage, and convenience. Some dogs show milder tartar accumulation when chewing certain kibbles — dental benefit is real for some products but never replaces brushing or professional cleaning. Wet food increases moisture intake, which helps dogs that drink little, and often boosts appetite in seniors or convalescing pets.
Mixing wet and dry is fine if total calories are counted. “Grain-free” is not automatically healthier; discuss diet history with your vet if cardiac concerns or unusual ingredients are involved. The best food is the complete formula your dog maintains ideal weight on, digests well, and will actually eat.
Raw diet risks
Raw feeding appeals to owners seeking “natural” meals, but public-health and veterinary bodies repeatedly flag two problems: pathogens (Salmonella, Listeria, and others that can affect dogs and people in the home) and nutrient imbalance when recipes are incomplete. Bones add fracture and obstruction risks; grinding does not remove bacterial hazard.
If you still prefer raw or home-prepared food, work with a board-certified veterinary nutritionist, use validated recipes, practise strict hygiene, and accept that immunocompromised household members raise the stakes. Commercial high-pressure-processed or gently cooked complete diets are often safer middle paths than DIY raw.
Puppy, adult, and senior feeding
Growth, maintenance, and aging are different nutritional jobs. Large-breed puppies need controlled calcium and energy to reduce developmental orthopaedic disease risk; toy puppies need frequent meals to avoid hypoglycaemia. Adults need portion discipline more than exotic ingredients. Seniors may need fewer calories, softer textures, and screening for kidney or dental disease that changes what they can safely eat.
| Life stage | Diet focus | Notes |
|---|---|---|
| Puppy | Growth formula | Higher calories, calcium/phosphorus balance for bone growth |
| Adult | Maintenance | Match energy to activity; keep lean body condition |
| Senior | Often lower calorie | Joint support and kidney monitoring under vet advice |
| Working / highly active | Performance diets | More energy density; still complete nutrition |
| Medical diets | Prescription only | Kidney, urinary, allergy, or GI formulas — vet directed |
Longevity and weight are tightly linked — see how long dogs live for why lean body condition adds healthy years.
Portion control and toxic foods
Bag charts assume an average metabolism. Neutered dogs, couch companions, and food-motivated breeds often need less. Use body-condition scoring: you should feel ribs easily and see a waist from above. Sudden appetite loss, vomiting, or diarrhoea warrants a vet visit — do not keep “waiting it out” with random diet swaps.
Never share chocolate, xylitol-sweetened products, grapes, raisins, onions, garlic, alcohol, or macadamia nuts. Full lists and emergency steps: foods dogs cannot eat and chocolate poisoning in dogs .
Safe feeding basics
A simple routine prevents most nutrition disasters: complete food, measured meals, clean water, gradual transitions, and toxin-proof storage. Pair feeding with the broader welfare habits in our dog care guide .
- Choose a complete diet. Pick a food labelled complete and balanced for your dog’s life stage (puppy, adult, or senior). Prefer brands that meet established nutrient profiles and, when possible, feeding-trial standards.
- Measure every meal. Use a kitchen scale or a true measuring cup. Free-feeding dry food is a common path to obesity — especially in easy keepers and neutered pets.
- Transition food gradually. Mix increasing amounts of the new food over 5–7 days to reduce digestive upset when changing brands or formulas.
- Keep toxins locked away. Store chocolate, xylitol products, grapes, and trash out of reach. Know emergency contacts before you need them.
- Recheck body condition. Feel ribs monthly and adjust portions. Book a vet review if weight climbs, appetite crashes, or stools stay abnormal.
Key takeaway
Complete diet + measured portions + toxin awareness beats any trendy feeding philosophy for the average companion dog.
Sources
FAQs
What do dogs eat?
Companion dogs thrive on complete-and-balanced commercial diets formulated for their life stage. Ancestrally they are scavenging omnivores descended from wolves — they can digest starches better than wolves — but modern pets should not live on table scraps alone.
Are dogs carnivores or omnivores?
Dogs are best described as opportunistic omnivores (scavenging carnivores with omnivorous flexibility). They need animal-derived nutrients but can use plant starches and fibres when diets are properly formulated.
Is wet or dry food better for dogs?
Both can be excellent if labelled complete and balanced. Dry food is convenient and may support dental abrasion; wet food adds moisture and palatability. Many dogs do well on a mix — portion control still matters.
Is a raw diet safe for dogs?
Raw feeding carries documented risks of bacterial contamination (for dogs and household members) and nutrient imbalance if recipes are incomplete. Major veterinary organisations urge caution; discuss any raw plan with your vet.
How much should I feed my dog?
Start with the feeding guide on the bag, then adjust to keep a visible waist and ribs you can feel under a light fat cover. Activity, neuter status, and metabolism vary — weigh monthly and ask your vet to score body condition.
What human foods are toxic to dogs?
Chocolate, xylitol, grapes/raisins, onions/garlic, alcohol, and macadamia nuts are high-priority dangers. See our toxic foods guide and chocolate poisoning page for emergency steps.
Do puppies and seniors eat the same food?
Usually no. Puppies need growth formulas with appropriate calcium balance; seniors often need fewer calories and may benefit from diets tailored to kidney, joint, or cognitive changes under veterinary guidance.
Related: Dog profile · Foods dogs cannot eat · Chocolate poisoning · How to care for a dog