How to choose the best dog food: an owner's guide

Walk down any pet food aisle and you'll find dozens of bags all claiming to be the best choice for your dog. Grain-free, raw, "ancestral", hypoallergenic, breed-specific — the marketing can make a simple job feel overwhelming. The good news is that choosing well doesn't require decoding every buzzword on the front of the pack.

What matters most is whether a food is nutritionally complete, suited to your dog's life stage and health, and fed in the right amount. Everything else — the colour of the kibble, whether it's grain-free, how exotic the protein sounds — matters far less than owners are often led to believe.

This guide walks through what to actually look for on a label, how to match food to your dog's age and needs, and the common mistakes worth avoiding, so you can make a confident, evidence-based decision rather than a marketing-led one.

Start with "complete", not the ingredients list

The single most important word on any bag or tin is complete. A complete food contains every nutrient your dog needs, in the right balance, with no need for extra supplements or mixing with other foods. A complementary food, by contrast, is only meant to be fed alongside something else — treats, toppers and some tinned meats fall into this category, and feeding one as a sole diet can leave your dog short of key nutrients over time.

PDSA vets recommend feeding a high-quality, complete commercial diet rather than attempting to formulate meals at home, noting that homemade diets are very difficult to get nutritionally right and can leave gaps that build up into deficiencies over months. If you do want to home-cook for your dog, this should only be done with recipes designed and checked by a veterinary nutritionist.

It's also worth knowing that in the UK, products carrying the UK Pet Food approval mark are formulated to standards that exceed the legal minimums, which gives an extra layer of reassurance beyond the basic legal requirement that all pet food sold in the UK must be safe and truthfully labelled.

Reading the label properly

It's tempting to judge a food by its ingredients list — "chicken is listed first, so it must be the best" — but this instinct can actually mislead you. According to the World Small Animal Veterinary Association (WSAVA) Global Nutrition Committee, most owners consider the ingredient list the most important factor when choosing a food, yet the list on its own gives no information about the *quality* of those ingredients, and can be used quite deliberately to make a product look better than it is.

A few practical points that genuinely matter more:

• Ingredients are listed by weight, heaviest first — but a fresh meat listed as "chicken" includes its natural water content, so it can appear higher on the list than a meat meal that's actually more concentrated in protein once that water is removed. This doesn't make either wrong, but it explains why ingredient order alone is a poor way to compare foods.
• UK Pet Food notes that ingredients can be declared either as broad category names (such as "meat and animal derivatives" or "cereals") or as individual named ingredients, but a manufacturer isn't allowed to mix the two styles within the same list. If a food is advertised with a particular ingredient — "with chicken", for example — the percentage of that ingredient has to be stated.
• Look for the nutritional adequacy statement. This is the line confirming the food meets recognised nutrient profiles for a particular life stage (growth, adult maintenance, or "all life stages"). This tells you far more about suitability than the ingredients themselves.
• Feeding guidelines on the pack are a starting point, not gospel — more on that below.

Rather than relying on marketing terms on the front of the pack, WSAVA's guidance encourages owners to ask a food manufacturer harder questions: who formulated the diet (a qualified veterinary nutritionist, ideally), whether the company employs its own nutrition staff, what quality-control and safety testing is carried out, and whether feeding trials back up the product's claims. Reputable manufacturers should be willing and able to answer these questions.

The ingredient list tells you what's in the bag — not whether the diet is actually well balanced for your dog.

Matching food to life stage

Puppies, adults and senior dogs have different nutritional needs, and feeding an inappropriate life-stage food for a long period is one of the more common, avoidable mistakes owners make.

Puppies need a growth formula with higher energy, protein and specific mineral levels to support healthy development. PDSA advises transitioning gradually from a breeder's food onto your chosen puppy diet, and continuing on a growth formula until your puppy reaches roughly adult size — this varies by breed, with large and giant breeds needing longer on a growth diet, and ideally one specifically formulated or approved for large-breed growth, since these dogs are more prone to developmental bone and joint problems if fed inappropriately.

Adult dogs generally do well on a maintenance formula once fully grown, with the right choice depending on their size, activity level and whether they're neutered — neutered dogs typically need fewer calories than intact dogs of the same size, as their maintenance energy requirement drops.

Senior dogs benefit from a formula that reflects their changing needs — often lower in calories if they're less active, but supporting joint health, healthy digestion and, in some cases, kidney function. PDSA notes the transition to a senior diet tends to happen somewhere between five and seven years old, with larger breeds generally considered "senior" earlier than small ones.

Whichever stage your dog is at, any diet change should happen gradually over a week to ten days, mixing increasing amounts of the new food with decreasing amounts of the old, to avoid an upset stomach.

Dry, wet, or a mix?

There's no single right answer here — dogs can thrive on dry kibble, wet/tinned food, or a combination of both, provided whatever you choose (or combine) is complete. Some practical trade-offs worth knowing:

• Dry food (kibble) is generally more calorie-dense for its weight, tends to be more economical, and can help mechanically reduce plaque build-up on teeth as your dog chews.
• Wet food has a much higher water content, which can help dogs who don't drink enough, and is often more palatable for fussy eaters, puppies being weaned, or older dogs with dental issues.
• Mixed feeding (part wet, part dry) is a common and perfectly reasonable approach, as long as you adjust portions so the combined calories match your dog's needs rather than simply adding a full serving of each.

If your dog is a fussy eater, resist the temptation to keep switching brands or adding extra toppers to encourage eating — this can reinforce fussy behaviour and disrupt gut health. Instead, stick with a complete diet and talk to your vet if appetite loss persists, since it can occasionally signal an underlying health issue.

Getting portions right

Even an excellent food can cause problems if you're feeding too much of it. PDSA's guidance is clear: use the feeding guide on the pack as your *starting point*, not a fixed rule, and feed for your dog's target (ideal) weight rather than their current weight if they need to lose a few pounds.

A few habits make a real difference:

• Weigh food out with digital kitchen scales rather than eyeballing a scoop — scoop measurements are notoriously inaccurate and are one of the most common causes of gradual weight gain.
• Count treats and chews as part of the daily total, not extra to it. Treats can quickly add up to a significant proportion of daily calories in a small dog.
• Watch out for double-feeding in multi-person households, or extra titbits from well-meaning family members, neighbours or dog walkers — PDSA specifically flags this as an easy way for a dog's intake to creep up unnoticed.
• Our Pet Calorie Calculator can help you work out a sensible daily calorie target based on your dog's weight, life stage and activity level, which you can then check against the feeding guide on your chosen food.

Carrying extra weight is linked to a range of health problems in dogs, from joint strain to reduced life expectancy, so getting portions right is genuinely one of the highest-impact things you can do for your dog's long-term health — arguably more important than the specific brand or recipe you choose.

Food allergies, sensitivities and elimination diets

True food allergies are less common than owners often assume, but food intolerances and sensitivities do occur, and can show up as itchy skin, ear problems, digestive upset or symptoms of inflammatory bowel disease.

If your vet suspects a food-related issue, they may recommend a food trial (also called an elimination diet). PDSA describes this as feeding a specific veterinary-prescribed diet — often a novel protein or a hydrolysed formula — for at least six to twelve weeks, with absolutely nothing else eaten in that time: no treats, no dental chews, no scraps, no flavoured medication if it can be avoided, and no titbits from other family members. Even small deviations can undermine the trial and mean it has to start again.

The most frequently implicated ingredients in genuine food allergies are specific proteins, such as beef, chicken or dairy, and some dogs are found to react to more than one ingredient. If symptoms clear up or improve significantly during the trial, and then return when the original food is reintroduced, this points strongly to a food-related cause. This process should always be led by your vet — self-directed ingredient swapping at home rarely gives a reliable answer and can mask or delay diagnosis of other conditions.

What about raw feeding?

Raw feeding has become more popular in recent years, and some owners report their dogs do well on it. However, the veterinary consensus is cautious. The British Veterinary Association (BVA) highlights that because raw meat isn't cooked, harmful bacteria such as *E. coli*, salmonella, listeria and campylobacter aren't killed off — these can make your dog ill and can also be shed in faeces or transferred to kitchen surfaces, posing a risk to human members of the household, particularly anyone who is very young, elderly, pregnant or immunocompromised.

If you do choose to feed raw, the BVA recommends treating it like raw meat for human consumption: check it for signs of spoilage, store it in a dedicated fridge or freezer away from human food, and use separate utensils, bowls and surfaces that are cleaned thoroughly afterwards. Veterinary hospital guidance from VCA similarly notes that strong scientific evidence for raw diets' claimed benefits is limited, and that the food-safety risks are well documented, so this is a decision worth discussing with your vet rather than making on marketing alone.

Common mistakes when choosing a food

A few patterns come up again and again:

• Judging quality purely by price or packaging. Premium pricing and rustic branding don't guarantee a better-formulated diet — the nutritional adequacy statement and the manufacturer's approach to quality control are far more telling.
• Switching foods too often. Frequent changes make it harder to spot if a particular diet doesn't suit your dog, and can contribute to digestive upset.
• Ignoring life stage. Feeding an adult formula to a growing large-breed puppy, or an all-life-stages food that's too calorie-dense to an inactive senior, are both easy mistakes with real consequences over time.
• Trusting grain-free as automatically healthier. For most dogs without a diagnosed grain sensitivity, grain-free offers no proven benefit, and some ingredient substitutions used in grain-free formulas have themselves become a subject of ongoing research and discussion in veterinary nutrition circles.
• Overlooking the transition period when changing food, which is one of the most common causes of short-term vomiting or loose stools that owners then wrongly blame on the new food itself, rather than the sudden switch.

If you're weighing up a specific ingredient or wondering whether something your dog has got into is actually safe, our Can My Pet Eat This? tool is a quick way to check.

When to see your vet

Get advice from your vet if your dog is losing or gaining weight unexpectedly, has ongoing digestive upset, itchy skin or ear infections that could be diet-related, is refusing food for more than a day or two, or if you're planning any significant diet change for a dog with an existing health condition. PDSA is clear that if you're ever unsure what to feed your dog, your vet or a veterinary nurse can give advice tailored to your individual dog's age, breed, weight and health, which is always more reliable than general guidance or forum recommendations.

*This is general guidance, not a substitute for advice from your vet, who can assess your individual pet.*

Sources

• PDSA — a guide to the right dog diet and health tips (pdsa.org.uk).
• PDSA — how to conduct a food trial for dogs (pdsa.org.uk).
• UK Pet Food — demystifying pet food labels (ukpetfood.org).
• WSAVA Global Nutrition Committee — global nutrition guidelines and pet food selection guidance (wsava.org).
• VCA Animal Hospitals — general feeding guidelines for dogs (vcahospitals.com).