Feeding Your Dog Through Every Life Stage
A dog's nutritional needs are not static. From the rapid growth of puppyhood through to the slower pace of the senior years, what a dog needs from their diet shifts considerably - and feeding the right food at the right life stage is one of the most impactful things an owner can do for their dog's long-term health. This post covers the four key life stages: puppies, adults, seniors, and pregnant or nursing dogs. At each stage I'll look at what changes nutritionally, what to look for in food, and the most common mistakes owners make.
Puppies
Why this stage matters more than any other: The decisions you make about a puppy's diet during their first year of life, or longer in large and giant breeds, have consequences that echo across their entire lifespan. This is the period of most rapid growth and development, when bones, joints, organs, the immune system, the gut microbiome and the brain are all forming. Nutrient deficiencies or imbalances during this window can lead to developmental problems that are difficult or impossible to reverse later. Getting puppy nutrition right isn't optional, it's foundational.
What puppies need: Puppies need significantly more protein, fat and certain vitamins and minerals than adult dogs, particularly calcium and phosphorus for bone development, DHA for brain and eye development, and higher overall calorie density to fuel their rapid growth. However, and this is critical, more is not always better. Particularly in large and giant breeds, overfeeding and excessive calcium supplementation during puppyhood is one of the leading causes of developmental orthopaedic disease, including conditions like hip dysplasia and osteochondrosis. Large breed puppies need carefully controlled calcium and phosphorus levels. Growth should be steady and moderate, not rapid.
A note on puppy food labelling: You may have noticed that "puppy food" is a category in itself, heavily marketed with specific branding. The honest truth, supported by integrative vets including Dr Karen Becker, is that for most small and medium breed puppies, a high-quality food labelled "complete for all life stages" is perfectly appropriate, and in many cases preferable to a specifically branded puppy food. "All life stages" formulations are required to meet the nutritional needs of growing dogs as well as adults. The genuine exception is large and giant breed puppies, where the calcium and phosphorus ratios during growth genuinely matter and warrant specific formulation. For large breeds, look for food specifically formulated for large breed puppy growth, this is not marketing, it reflects real nutritional differences. For small and medium breeds, a high quality "all life stages" food is an excellent choice.
What to look for:
Food labelled as complete and specifically formulated for all life stages, or for puppy growth
For large breeds, food specifically labelled for large breed puppy growth
Named protein as the first ingredient with a declared percentage
DHA listed, ideally from a marine source, for brain and eye development
No artificial additives, colours or preservatives
A good rating on All About Dog Food
A note on raw feeding for puppies: You'll see raw feeding for puppies described as risky or outright discouraged on a lot of mainstream advice sites, often without much explanation beyond general caution. It's worth understanding the actual reasoning rather than taking a blanket "no" at face value. The genuine concern isn't that raw meat itself is unsuitable for a puppy's digestive system, puppies handle raw protein well, and many breeders and raw-feeding advocates start puppies on raw from weaning with good results. The real considerations are slightly different:
Nutritional balance matters even more during growth, particularly calcium and phosphorus ratios for developing bones. A poorly formulated DIY raw diet is a bigger risk during puppyhood than in adulthood, simply because there's less margin for error while bones and joints are actively forming. If feeding raw, a complete, properly formulated commercial raw diet specifically balanced for growth, not just "complete for adult maintenance" is important, and working with a canine nutritionist to check the formulation is genuinely worthwhile at this stage.
Immune system development is still underway in young puppies, which is the basis for some of the caution around bacterial risk, though this is the same reasoning that applies to raw feeding at any life stage, not something unique to puppies specifically.
Large and giant breed puppies need the same careful calcium and phosphorus control on a raw diet as they do on a commercial one, this doesn't disappear just because the food is raw rather than kibble.
If you're keen to raw feed a puppy, the sensible approach is a complete commercial raw diet specifically formulated for growth, ideally with input from a canine nutritionist, rather than an ad hoc DIY approach. Done properly, raw feeding from puppyhood is a legitimate choice many experienced raw feeders make with good results, the caution you'll see elsewhere is less about raw being inherently wrong for puppies, and more about the higher stakes of getting the formulation wrong during a critical growth window.
Common mistakes at the puppy stage:
Overfeeding is the most common. Puppies are appealing and it's tempting to feed generously, but excess weight during puppyhood puts significant strain on developing joints. Follow feeding guidelines as a starting point and adjust based on body condition, you should be able to feel your puppy's ribs without pressing hard, but not see them prominently.
Supplementing with calcium on top of a complete puppy food is actively dangerous in growing dogs, particularly large breeds. If you're feeding a complete food, additional calcium supplementation is unnecessary and harmful.
Whole food additions for puppies: This is a life stage where organic additions are particularly worthwhile. A developing puppy's organs and detoxification systems are immature, so minimising exposure to pesticide residues where possible is genuinely meaningful. Organic eggs, organic blueberries, a little organic kefir to support gut microbiome development, small additions that make a real difference during a critical window.
Adult Dogs
Maintaining optimal health: Once a dog reaches adulthood, typically around 12 months for small breeds, 18 months for medium breeds, and up to 24 months for large and giant breeds, nutritional needs stabilise and the focus shifts from growth to maintenance.
How to tell whether the diet is working: Your dog's body will tell you whether their diet is right for them. The markers of a diet that's genuinely working:
Coat condition: glossy, soft and healthy. A dull, dry or flaky coat is often one of the first signs of nutritional insufficiency, particularly omega-3 deficiency.
Skin health: minimal itching, flaking or redness. Chronic skin issues are frequently diet-related.
Stool quality: firm, well-formed and not excessively large. Very large, loose or frequently inconsistent stools suggest poor digestibility.
Energy levels: appropriate for age and breed.
Weight and body condition: you should be able to feel the ribs without pressing hard but not see them prominently. A waist should be visible from above.
Dental health: significant buildup can be influenced by diet, particularly high-carbohydrate food.
Bright eyes and a generally thriving appearance: harder to quantify but unmistakable when you see it.
When to adjust: Life circumstances change and the diet should reflect that. A highly active working dog has different calorie and protein needs to a neutered, moderately active companion. Weight gain should prompt a review of both food quantity and quality, rather than simply reducing portions of a poor quality food, consider whether upgrading the food itself might support a healthier weight more effectively.
Senior Dogs
When does a dog become a senior? There's no universal answer, it varies considerably by breed size. Small breeds typically reach senior status around 10–11 years. Medium breeds around 8–9 years. Large breeds around 7 years. Giant breeds can be considered senior from as early as 5–6 years given their shorter overall lifespan.
What changes nutritionally:
Digestion becomes less efficient. The production of digestive enzymes declines with age, meaning seniors may absorb nutrients less effectively from the same food that served them well in adulthood. This makes food quality even more important in the senior years, not less, and is one reason digestive enzyme supplementation is worth considering for older dogs.
Joint health becomes a priority. Inflammation, stiffness and arthritis are common in older dogs regardless of breed. Omega-3 fatty acids, green lipped mussel, and joint-supportive additions become increasingly worthwhile at this stage.
Immune function declines. Antioxidant-rich additions, blueberries, spirulina, organic vegetables, support immune health and help manage the increased oxidative stress that comes with ageing.
Busting the senior protein myth: One of the most persistent and damaging myths in canine nutrition is that senior dogs need less protein. This is not supported by evidence, and in fact the opposite is often true. Older dogs are less efficient at utilising dietary protein and frequently need the same or higher protein levels than younger adults to maintain muscle mass. Muscle loss in senior dogs is a significant welfare concern and is frequently accelerated by well-meaning owners switching to lower-protein senior foods. Reduce protein only if specifically advised to do so by a vet or canine nutritionist based on a diagnosed health condition. Do not reduce protein simply because the packaging says "senior."
Senior dogs and organic additions: This is the second life stage where organic additions are especially worthwhile. An older dog's liver and kidneys are working harder to process everything that comes in. Reducing the cumulative burden of pesticide residues and artificial additives where possible is genuinely kind and meaningful. Fresh organic vegetables, organic eggs, and a good whole food multivitamin topper are all particularly good additions for senior dogs.
Weight management in seniors: For overweight seniors, reducing portion size while maintaining nutrient density is the priority, switching to a lower calorie, lower quality food is rarely the right answer. For underweight seniors, increasing the calorie and nutrient density of what's being fed, through quality food and additions like eggs, sardines and bone broth, is usually more effective than simply feeding more of the same food.
A note on raw feeding for seniors: Similarly, raw feeding is sometimes discouraged for older dogs, and again it's worth understanding why rather than dismissing raw outright at this stage.
The genuine considerations here are individual rather than universal. A healthy senior dog with no underlying health conditions can generally continue eating raw perfectly well, age alone isn't a reason to stop. The real caution applies to seniors with specific, diagnosed circumstances:
Dogs on immunosuppressive medication, such as long-term steroids, or dogs undergoing treatment for cancer, where a compromised immune system genuinely does increase the risk associated with raw feeding's bacterial load.
Dogs with dental disease or missing teeth may struggle with certain raw feeding formats, particularly meaty bones, though minced or ground raw remains an option here.
Dogs with kidney disease may need a lower-protein or specifically formulated therapeutic diet, which is a separate conversation from raw versus cooked, and should be guided by a vet.
For a healthy senior with no underlying condition, there's no strong evidence that raw feeding needs to stop simply because a dog has reached a certain age. As with every stage covered in this post, the individual dog's health status matters more than a blanket rule based on age alone. If your senior dog has a diagnosed health condition, that's the conversation to have with your vet or a canine nutritionist, rather than raw feeding being ruled out by default.
Pregnant and Nursing Dogs
Increased nutritional demands: Pregnancy and lactation place exceptional demands on a female dog's nutritional resources. This is not a life stage to manage on a budget food or to leave to chance.
During pregnancy, particularly in the final third of gestation when puppies are growing most rapidly, calorie requirements increase significantly. High quality, easily digestible protein is essential for healthy foetal development. DHA is particularly important during this period for the brain and eye development of the developing puppies.
During lactation, the most nutritionally demanding period of all, a nursing dog may need two to three times her normal calorie intake depending on litter size. The nutritional quality of her milk is directly determined by her diet.
What to feed: A high-quality food formulated for all life stages is generally the most appropriate choice during pregnancy and lactation. Puppy food can be used during lactation due to its higher calorie and nutrient density. Fresh food additions, eggs, sardines, bone broth, kefir, are all excellent and appropriate during this period. Organic additions are particularly worthwhile given the direct nutritional transfer to developing puppies.
What to avoid: Calcium supplementation during pregnancy is specifically contraindicated. It can interfere with the natural calcium mobilisation process during whelping and is associated with eclampsia (milk fever) in nursing dogs. If you're concerned about calcium intake, discuss it with a canine nutritionist or vet rather than supplementing independently.
A Final Thought on Life Stages
The common thread running through every life stage is this: the better the quality of food, and the more it's supported by real, whole food additions appropriate to that stage, the better equipped your dog's body is to navigate whatever that stage demands of it.