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What to Feed an Older Dog: A UK Nutrition Guide

As dogs age, their nutritional needs change in ways that standard adult dog food may not adequately address. Senior dogs are more prone to weight gain, muscle loss, joint disease, kidney changes and dental problems — all of which have dietary implications. Understanding what to feed your older dog can make a real difference to their quality of life in their later years.

When Is a Dog Considered Senior?

There is no single age at which a dog becomes 'senior' — it varies significantly by breed and body size. Small and toy breeds (Chihuahuas, Dachshunds, Jack Russell Terriers) typically age more slowly and are often not considered senior until 10–12 years. Medium breeds (Spaniels, Beagles) transition to senior status around 7–9 years. Large and giant breeds (Labradors, German Shepherds, Great Danes) are considered senior from 6–7 years, and may have a shorter overall lifespan.

Rather than going by age alone, watch for signs of ageing that suggest dietary adjustment may be beneficial: reduced activity, weight changes, stiffness on rising, changes in coat quality, changes in appetite, or increased water consumption. These are worth discussing with your vet.

The transition to a senior diet does not need to happen suddenly at a particular birthday — it is a gradual process guided by your individual dog's health.

How Nutritional Needs Change With Age

Older dogs typically have lower energy requirements because their metabolism slows and they tend to be less active. If they continue eating the same amount of an adult food, weight gain is common — and obesity in senior dogs worsens joint disease, puts strain on the heart and kidneys, and reduces lifespan.

At the same time, many senior dogs develop muscle wasting (sarcopenia) despite being overweight. Counterintuitively, they may actually need more dietary protein — not less — to maintain muscle mass, provided their kidneys are healthy. The old advice to reduce protein in senior dogs has been largely revised; current evidence suggests adequate high-quality protein is important for lean muscle maintenance in most senior dogs.

Kidney function commonly declines with age. If blood tests indicate reduced kidney function, your vet may recommend a kidney-supportive diet with adjusted protein levels, reduced phosphorus and controlled sodium — these are prescription diets and should not be started without a diagnosis.

Joint Health and Anti-Inflammatory Nutrition

Osteoarthritis affects an estimated 20% of dogs over one year old and is far more prevalent in senior dogs. Diet plays a meaningful role in managing joint disease. Maintaining a healthy body weight is the single most impactful intervention — every kilogram of excess weight places additional force on arthritic joints.

Omega-3 fatty acids, particularly EPA and DHA from marine sources, have good evidence for anti-inflammatory effects in arthritic dogs. Many senior dog foods include added fish oil, and standalone omega-3 supplements are widely available. Look for products with published EPA/DHA content — not just 'contains fish oil'.

Glucosamine and chondroitin are commonly included in senior dog foods and joint supplements. The evidence for their direct benefit is mixed, but they appear safe and may offer modest benefit. Prescription joint diets from Hills, Royal Canin or Purina Pro Plan have generally undergone more rigorous testing than general pet shop supplements.

Dental Health in Senior Dogs

Dental disease is near-universal in older dogs and has been linked to systemic health problems including heart and kidney disease. Senior dogs often have reduced dental health, missing teeth or mouth pain that affects their ability to eat hard kibble comfortably.

For dogs with dental problems, transitioning to a softer food — wet food, gently cooked food, or soaked kibble — may be necessary. Do not force a dog with mouth pain to eat hard food they are struggling with.

Professional dental cleaning under general anaesthetic remains the only way to properly address established dental disease. Dog dental scale and polish costs typically £150–£400 at UK practices, including anaesthetic. At senior ages, a pre-anaesthetic blood screen (approximately £80–£120) is advisable before any procedure.

Choosing a Senior Dog Food

Senior dog foods vary considerably in quality and formulation. Look for foods that are lower in calories but maintain high-quality protein, include omega-3 fatty acids, and have added joint supplements. Avoid foods that have dramatically reduced their protein content as a blanket 'senior' modification — this is appropriate only if your dog has diagnosed kidney disease.

For dogs with specific health conditions, prescription therapeutic diets from your vet are often the most appropriate choice. These are formulated for specific conditions and have clinical evidence behind them. They cost more than standard foods — typically £50–£90 per month for a medium dog — but can reduce treatment costs for the condition they address.

Regular vet check-ups are particularly important for senior dogs. Annual blood and urine testing can detect emerging kidney, liver or other organ changes before they become severe.

Find a Vet Near You

Senior dogs benefit from twice-yearly vet check-ups. If you are concerned about your older dog's weight, diet or energy levels, booking a consultation is the best next step. Standard UK consultation fees average £61.99.

Use [CompareMyVet](https://app.comparemyvet.uk) to compare vet prices near you and find practices offering senior pet health services at transparent, fair prices.