Arthritis and Osteoarthritis in Senior Dogs and Cats

As pets age, the risk of joint problems in dogs and cats naturally increases. Arthritis — an inflammatory condition that disrupts normal joint function — is one of the most common issues. Many senior pets also develop osteoarthritis, a chronic degenerative disease in which joint cartilage gradually breaks down, bone structure changes, and mobility becomes limited, causing the animal to limp. While arthritis and osteoarthritis develop through different mechanisms, they often occur together and can worsen each other's effects on the body.

What Causes Arthritis and Osteoarthritis?

In senior dogs and cats, limping caused by these conditions is often the result of cartilage losing its ability to repair itself, joints losing elasticity, and poor blood flow to surrounding tissue. Other contributing factors include:

1. Genetic predisposition. Large breeds have a higher risk of hip and elbow dysplasia, which can speed up the development of osteoarthritis.
2. Excess body weight. Extra weight puts added strain on the joints, wearing down cartilage faster and encouraging inflammation.
3. Metabolic issues. Endocrine disorders and a slow metabolism can negatively affect bone and joint health.
4. Injuries. Sprains, dislocations, fractures, and similar injuries can disrupt normal joint function and lead to chronic changes.
5. Infectious and autoimmune diseases. In some cases, arthritis in dogs and cats results from a viral infection or an immune system disorder.

That's why prevention matters: regular physical activity, a balanced diet, prompt care after any injury, and at least one veterinary checkup a year can help protect your pet from musculoskeletal disease later in life — or significantly delay its onset.

Symptoms of Arthritis and Osteoarthritis

These conditions tend to develop so gradually that owners often miss the early signs. Arthritis and osteoarthritis in cats and dogs can come with a range of symptoms:

• Reluctance to play, run, climb stairs, or go on longer walks
• Stiffness after resting
• Limping or another unusual gait
• Vocalizing when the joints are touched
• Difficulty lying down or getting up
• Irritability or even aggression due to pain

In dogs, symptoms tend to be more obvious — limping and whimpering — while cats often just become less active. Signs of joint pain in cats can include no longer jumping to their usual favorite spots and grooming themselves less often.

Diagnosis and Treatment

An experienced orthopedic veterinarian should assess your pet's joints and bones. After a visual evaluation of mobility, they'll typically perform X-rays and a joint ultrasound. A CT scan, bloodwork, and joint fluid analysis may also be needed.

If the joint can still be helped, a course of chondroprotectants may be prescribed to restore cartilage elasticity and support joint fluid production. Platelet-rich plasma (PRP) therapy — which uses the patient's own blood cells to promote healing — can also be a good option.

Once cartilage has broken down completely, it can't be restored, but pain medication and anti-inflammatories can still make a real difference in comfort and quality of life. Other essential treatment approaches for pets with arthritis and osteoarthritis include:

• A vet-designed diet plan to manage body weight and reduce strain on the joints
• Physical therapy: massage, hydrotherapy, magnetic therapy, and therapeutic exercise programs

In more advanced cases, surgery may be the only way to restore normal joint function and put an end to chronic pain. With the right care from a skilled orthopedic veterinarian at our Animal Clinic network, even senior pets can enjoy an active, comfortable life.