Overweight Dog and Joint Pain: What Can You Do?

Excess weight in dogs is not just a matter of appearance: it is a factor that can aggravate joint problems, as documented by several leading veterinary studies. By helping your dog lose weight and adopting a few good habits, you can significantly improve their mobility and comfort.

Why does excess weight make joint problems worse?

Increased mechanical load on the joints

Every extra kilo puts direct pressure on the animal's musculoskeletal structures. This extra load increases pressure on the hips, elbows, and knees (stifles) and accelerates wear on joint cartilage.

Labradors fed ad libitum develop signs of osteoarthritis 2 years earlier than littermates given a 25% restricted ration. At age 8, 43% of overfed dogs show osteoarthritis, compared with only 10% in the restricted group.

Kealy et al.

Chronic inflammation linked to adipose tissue

Adipose tissue (body fat) is not simply an energy store: it secretes inflammatory molecules, including pro-inflammatory cytokines such as TNF-α, interleukin-6 (IL-6) and leptin. These molecules maintain a state of chronic inflammation, accelerating breakdown of joint cartilage and reducing its ability to regenerate.

Marshall's 2009 review describes this relationship between obesity, inflammation and joint breakdown in detail. It notes that systemic inflammation may be present even before the first visible signs of osteoarthritis appear.

Sedentary lifestyle makes excess weight worse

When joints are painful, dogs move less. This inactivity reduces muscle mass, slows metabolism, and promotes weight gain. This is what is known as a vicious cycle: excess weight → joint pain → less activity → even more excess weight.

How do you know if your dog is affected?

Assess body condition score (BCS)

The Body Condition Score (BCS) rated from 1 to 9, allows you to assess a dog's physical condition visually and by touch. A score of 4 to 5/9 corresponds to an ideal weight. Above 6, the dog is considered overweight; 7 and above indicates obesity.

Telltale signs:

• You can no longer clearly feel their ribs under your fingers.
• The waist is no longer visible from above.
• The dog moves more slowly and avoids stairs and certain movements.

A vet can confirm the score and suggest a weight-management plan.

What to do if your dog is overweight with reduced mobility

Lose weight

In a study by Marshall et al. (2010), arthritic Labradors followed a 16-week weight-loss programme. The results included:

• Average loss of 6.1% of body weight
• Significant improvement in lameness index
• Reduction in signs of pain on exertion, according to vets and owners

This study shows that weight loss alone can improve mobility, even without other treatment.

Aim for a loss of 1% per week, under veterinary supervision.

Reintroduce appropriate physical activity

Staying active remains essential to maintain muscle, support the joints, and lose weight.

Recommendations include:

• Short, frequent walks (on grass or soft ground)
• Hydrotherapy (walking in a pool or on an underwater treadmill), which limits joint impact while strengthening muscles
• Support from a veterinary physiotherapist to adapt exercises to each case

Support mobility with targeted nutrition

Long-chain Omega-3 fatty acids (EPA and DHA) are valuable allies in reducing inflammation. They reduce the production of pro-inflammatory molecules, protect the joints and slow cartilage breakdown.

EPA/DHA supplementation improves mobility, pain, and clinical signs in dogs with osteoarticular disorders.

Magalhães et al.

Regular intake of EPA and DHA helps reduce chronic inflammation, support joint flexibility, and improve quality of life in dogs, especially those that are older or predisposed to joint problems.

› Combining weight loss, activity, and Omega-3 creates a lasting synergistic effect.

Support mobility naturally

At Laboratoire Sensilia, we regularly see that overweight dogs or those prone to locomotor stiffness benefit from targeted nutritional support, particularly through marine-derived omega-3 fatty acids.

A liquid supplement rich in EPA and DHA, from New Zealand green-lipped mussel oil and microalgae oil, can complement weight-loss efforts and help support mobility.

It is this scientific, natural approach that inspired the creation of PERNIXOL®, a liquid joint supplement formulated to support everyday joint flexibility without replacing weight loss or rehabilitation, but as a complement to them.

Conclusion

Excess weight is far more than an aesthetic issue: it is a major mechanical and inflammatory factor in a dog's joint health.

The good news is that gradual weight loss, adapted activity, and Omega-3-enriched nutrition can make a meaningful difference to an animal's quality of life.

In our experience at Laboratoire Sensilia, owners who commit to this approach see their dogs regain energy, greater ease and enjoyment of movement.

Scientific references

• Kealy RD, Lawler DF, Ballam JM, Mantz SL, Biery DN, Greeley EH, Lust G, Segre M, Smith GK, Stowe HD. Effects of diet restriction on life span and age-related changes in dogs. J Am Vet Med Assoc. 2002 May 1;220(9):1315-20. doi: 10.2460/javma.2002.220.1315. PMID: 11991408.
• Marshall W, Bockstahler B, Hulse D, Carmichael S. A review of osteoarthritis and obesity: current understanding of the relationship and benefit of obesity treatment and prevention in the dog. Vet Comp Orthop Traumatol. 2009;22(5):339-45. doi: 10.3415/VCOT-08-08-0069. Epub 2009 Aug 28. PMID: 19750285.
• Michael H. Jaffe, Multimodal Management of Small Animal Osteoarthritis, American College of Veterinary Surgeons Mississippi State University College of Veterinary Medicine, 2023
• Marshall WG, Hazewinkel HA, Mullen D, De Meyer G, Baert K, Carmichael S. The effect of weight loss on lameness in obese dogs with osteoarthritis. Vet Res Commun. 2010 Mar;34(3):241-53. doi: 10.1007/s11259-010-9348-7. Epub 2010 Mar 17. PMID: 20237844; PMCID: PMC2855019.
• Magalhães TR, Lourenço AL, Gregório H, Queiroga FL. Therapeutic Effect of EPA/DHA Supplementation in Neoplastic and Non-neoplastic Companion Animal Diseases: A Systematic Review. In Vivo. 2021 May-Jun;35(3):1419-1436. doi: 10.21873/invivo.12394. Epub 2021 Apr 28. PMID: 33910819; PMCID: PMC8193331.

This article was written by the R&D team at Laboratoire Sensilia, experts in animal nutrition.