Pain management in veterinary medicine is evolving rapidly, and one of the most powerful – and often underused – tools we have is nutrition and weight management. This article explores why weight and nutrition matter so much, why the physical load of obesity on joints isn’t the only risk of obesity, and what the evidence tells us about improving quality of life through dietary changes.  

The extent of the problem 

Previous PAW Reports have consistently found that the majority of owners perceive their pet to be an ideal weight, with 81% of owners telling us this in 2022 and 79% in 2020 and 2019.  

However, in contrast, findings from our survey in 2023 show that, on average, veterinary professionals estimate that 46% of dogs are overweight or obese and additional published studies have shown that up to 65% of the UK’s pet dogs are overweight or have obesity.  

So, we have a lot of owners who think their pets are the correct weight when the evidence tells us differently.  

Then we add in the mix osteoarthritis, a highly prevalent disease with 80% of dogs over 8 years experiencing and even young dogs being susceptible. In one study of young dogs, 39.8% of dogs had radiographic OA, and 16.3% or 23.6% dogs had clinical OA (cOA – where the arthritis is causing clinical problems for the pet, and isn’t just an incidental finding on an X-ray), depending on the cut-off value of joint pain; moderate, or mild, respectively. Owners of dogs with cOA observed signs of impairment in approximately 30% of cases.  

The impact of body weight on pain 

Many pet owners are surprised to learn that diet and a pet’s body condition score (BCS) can directly influence how much pain an animal feels. Yet the scientific evidence is clear: obesity, osteoarthritis (OA), chronic pain, and systemic inflammation are deeply interconnected. While we often think of excess weight as simply “extra load” on the joints—but the relationship is far more complex than this (although that is certainly one factor).  

Of course, the mechanical stress on joints is important; carrying additional body weight increases the force exerted on joints during movement. In dogs with osteoarthritis even modest weight reduction reduces this mechanical strain, making movement easier and reducing pain through the mechanical pressures on painful limbs and affected joints.  

However, the bit that is often not known is that adipose tissue (fat tissue) is a pro-inflammatory at a biological level. Research has reframed our understanding of adipose tissue. Fat is not passive storage, adding extra ‘cushioning’ (I hate that term) to your pet and just adding extra mechanical stress: it is biologically active, producing inflammatory mediators such as cytokines and adipokines. These compounds can:  

  • Increase systemic inflammation  
  • Heighten pain sensitivity  
  • Exacerbate osteoarthritis progression  

So what does that mean in practice? 

So, the obvious answer is that weight loss has potential to be an essential part of a treatment plan. Multiple scientific studies have demonstrated the positive impact of weight reduction on pain, mobility, and wellbeing.  

One study assessing 50 obese dogs found that those who completed a structured weight-loss programme showed significant improvements in:  

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  • Vitality  
  • Emotional wellbeing  
  • Pain levels  

This highlights weight control not just as a physical issue but as a welfare priority with emotional and behavioural implications.  

Another study evaluating obese dogs with OA showed measurable improvements in lameness after relatively small weight reductions:  

  • Noticeable improvement from just 6.1% weight loss  
  • Objective kinetic gait improvements from 8.85% weight loss  

These findings reinforce that weight loss should be positioned as a core component of pain management – not a secondary recommendation.  

Weight management and nutritional support remain some of the most cost-effective and impactful tools we possess in the veterinary pain management ‘toolbox’.  Combined with early recognition and prompt treatment of pain, weight management can dramatically improve a pet’s comfort and quality of life.  

For veterinary teams and pet owners alike, understanding these relationships empowers better decision-making and more compassionate, science-led care.  And of course, as we always say, prevention is better than cure! Lets be proactive, not reactive, and keep our pets at a body condition score of 4-5/9 throughout their life- see the WSAVA Body Condition Score for more help.  

Key Takeaways  

  • Weight matters: Even a small reduction (6–9% of body weight in overweight pets) can meaningfully reduce pain.  
  • Fat drives inflammation: Adipose tissue is pro-inflammatory and can worsen pain  
  • Nutrition is medicine: Diet influences pain, inflammation, and overall wellbeing.  
  • Weight loss improves quality of life: Scientifically proven across large studies.  

References and links  

Quality of life is reduced in obese dogs but improves after successful weight loss 

The effect of weight loss on lameness in obese dogs with osteoarthritis 

WSAVA Global Pain Guidelines – Section 1.12: Interplay of Nutrition and Pain 

Body Condition Score Dog (pdf)  

Dogs – PDSA