Obesity

Obesity in pets means carrying so much extra body fat that it starts to affect health, not just appearance. Vets usually assess this with a body condition score, a hands-on check of how much fat can be felt over the ribs, spine and waist, scored on a scale where the higher numbers mean more excess weight. On the commonly used nine-point scale, a score of 6 or 7 is considered overweight, while 8 or 9 counts as obese, roughly equivalent to carrying 30% or more above a healthy weight. It is worth knowing that this is treated as a real medical condition in its own right, not just a cosmetic issue, because in more severe cases the excess fat itself directly interferes with how the body moves, breathes and functions.

It matters because fat is not just inert padding. It behaves like an active organ, releasing hormones and inflammatory substances that can push the whole body into a low-grade state of inflammation and disrupt normal metabolism. This helps explain why overweight dogs and cats face a wider list of health problems than you might expect: joint disease and reduced mobility, breathing difficulty, higher surgical and anaesthetic risk, skin problems, some cancers, and in cats particularly diabetes and bladder or urinary tract issues. Dogs kept at a healthy weight throughout life have also been shown to live longer and develop chronic disease later than dogs carrying excess fat, which is part of why prevention is emphasised so strongly over treatment after the fact.

The condition is extremely common. Estimates suggest that somewhere between roughly a quarter and well over half of dogs and cats seen in veterinary practice are overweight or obese, making it one of the most frequent nutrition-related problems vets encounter. It tends to creep up gradually, through small daily excesses in food or treats, reduced activity, life stage changes such as neutering, ageing, or an underlying illness like an underactive thyroid, so many owners do not notice until a vet points it out on a body condition check.

A few signs that are worth mentioning to your vet rather than waiting on:

• You cannot easily feel your pet's ribs through a light layer of fat when you run your hand along the side of the chest
• No visible waist when looking down from above, or the belly sags or bulges from the side
• Reduced stamina, reluctance to jump or climb stairs, or slowing down on walks
• Noisy or laboured breathing with mild exertion

Because obesity develops from a mix of feeding habits, activity, life stage and sometimes underlying disease, there is no single fix that works for every pet, and what counts as an appropriate target weight or feeding plan varies with the individual. A vet visit is the right next step: it lets you confirm whether weight is actually a problem, rule out or manage any underlying medical cause, and build a safe, gradual plan rather than guessing at home. The guides below go into the practical side of that, from working out portions to structuring exercise and monitoring progress.