Arthritis in dogs and cats
What is arthritis in dogs and cats?
Arthritis is a general term for abnormal changes in a joint. Usually it relates to inflammation of the joint, which hampers movement and causes discomfort and pain. Arthritis often leads to further problems because the dog or cat suffering from arthritis is less mobile and gains weight, and continued disuse of the affected joint further impedes the joint’s mobility.
Normal joints have a layer of cartilage which acts as a cushion between the bones and provides a smooth surface for the adjoining bones to slide over freely. The joints also contain fluid which provides lubrication to assist with movement. When arthritis sets in, the cartilage deteriorates and the fluid loses its lubricating effect, resulting in less smooth movement of the bones, which causes discomfort and reduced mobility.
Arthritis in dogs is a common condition, affecting one in five adult dogs. It is a major cause of chronic pain in older dogs and can result in permanent joint damage. The most commonly affected joints in dogs are the hips, knees, shoulders and elbows.
Arthritis in cats was considered an uncommon condition in the past, but more recently this has been disproved. A study in 2011 showed that 61% of cats over 6 years old had at least one joint evidencing arthritic change, and a 2002 study showed that up to 90% of cats over 12 years showed signs of the disease. In cats, the most commonly affected joints are the shoulders, elbows, hips and spine.
There are three common forms of arthritis in dogs and cats:
Osteoarthritis / Degenerative Joint Disease
- A progressive degeneration of the cartilage between the joint bones, causing friction between the bones
- The most common form of arthritis in dogs and cats
- Most commonly seen in the weight-bearing joints of older animals
- Usually caused by wear-and-tear, but can also result from injury, fractures and dislocation
- Can lead to the bones eroding into each other, causing chronic pain
Septic Arthritis / Inflammatory Joint Disease
- Can be brought on by an infection or an injury
- Cartilage becomes inflamed around one or more joints
- Often there is also a build up of fluid around the joint
- Can result from an inherited immune system defect
Rheumatoid Arthritis / Polyarthritis
- Occurs when the animal’s own immune system attacks the joints as part of a general attack of the body’s tissues
- Causes damage to the joint lining and cartilage
- Can lead to erosion of the bones in the joint
Other much rarer forms of arthritis are:
- Metabolic – bleeding into joints
- Crystalloid – crystals form in the joints
- Neoplastic – joint cancer
Symptoms of arthritis in dogs and cats
Dogs and cats can behave differently in response to arthritic pain. Arthritis is very difficult to detect in cats, probably because cats are very good at hiding signs of pain or illness, and the most vigilant owners might struggle to detect signs of arthritic pain, even when the disease is fairly advanced. Many dogs are able to hide their pain and discomfort in the initial stages of the disease, making it hard for their owners to detect arthritis early on. As the disease progresses and the pain worsens, dog arthritis symptoms typically become more evident.
Many of the early cat and dog arthritis symptoms are gradual behavioural changes, such as a decrease in activity level, that may easily be mistaken for normal signs of aging instead of symptoms of arthritis. As your cat or dog ages, it is important to look out for subtle behavioural changes, as unfortunately the more obvious signs like limping in dogs may only occur in the end stage of long-term joint degeneration.
Subtle dog arthritis symptoms your dog may exhibit:
- Tires more easily, lags behind on walks
- More time spent sleeping and resting
- Less interested in playing, running and jumping
- Hesitation before jumping, running or climbing
- Stiffness when getting up or lying down
- Change in attitude or alertness, e.g. less excited to see you
- Weight gain
More noticeable dog arthritis symptoms can include:
- Limping or lameness – may be worse on waking and become less evident as the dog “warms up” and moves around
- Favouring one or more limbs
- Difficulty sitting or standing
- Difficulty with movements that were previously manageable, e.g. getting in and out of the car
- Muscle atrophy in the “favoured” limb
- Yelping when touched
- Personality changes, such as increased aggression
- Licking of the affected joints
- Chewing or biting the affected joints
Symptoms of arthritis in cats:
- Reduced mobility:
- Overall stiffness, occasionally a stiff gait when walking
- Urination outside litter box, because of painful movement getting in and out of it
- Inability to jump onto countertops, perches etc that were previously easily manageable
- Changes in grooming behaviour:
- Reduced or poor grooming, because of painful movement
- Over-grooming of painful joints, which may cause baldness or inflammation of the affected area
- Personality changes:
- More aggressive, snappish or irritable
- Dislikes being handled or touched in certain positions
- Reduced level of activity:
- Increased sleeping and resting
- Reluctance to go up and down stairs, run or jump
- Reluctance to go outside, play, hunt and explore
- Abnormal posture, for example a “hunch” back where arthritis occurs in the spine
Causes of arthritis in dogs and cats
There are number of causal and contributing factors for arthritis in dogs and cats:
- Joints degenerate naturally as they age because of ongoing wear and tear and instability in the joints
- Cartilage, which forms a cushion between the bones at the joint, deteriorates and wears away.
- Injury to joint surfaces and supporting structures, for example anterior cruciate ligament injury.
- Trauma to the joint, for example from a car accident, sharp object or bite.
- Excessive stress on the joint, for example for working dogs or sporting dogs.
- Infection in the joint, resulting in joint tissue destruction.
- Nutritional disorder brought on by poor nutrition.
- Overweight, obesity – not necessarily a cause, but it can make an existing condition worse.
- Occasionally, immune system disorders will lead to joint tissue inflammation and degeneration.
- Cushing’s disease – link to article Hyperadrenocorticism
- Congenital defects affecting structural architecture in some breeds may predispose them to developing arthritis, for example:
- Patella luxation – dislocation of the knee cap – is more common in Abyssinian and Devon Rex.
- Hip dysplasia – development disorder of the hip joints – is more common in Maine Coon, Persians and Siamese.
- Pure bred dogs have an increased tendency for osteoarthritis, for example German Shepherds, Labradors, Retrievers, Alaskan Malamutes and other larger breeds are prone to hip dysplasia.
What is the connection between hip dysplasia and arthritis?
- Hip dysplasia refers to the abnormal formation and misaligned stress points of the coxo-femoral joint.
- This causes the cartilage to wear away faster than it can regenerate.
- Arthritis sets in when the bony layer beneath the cartilage is exposed and the joint becomes inflamed, painful and restricted in mobility.
How is arthritis in dogs and cats diagnosed?
As the signs of arthritis in cats and dogs can be very subtle, it often goes undiagnosed. If arthritis is suspected, the vet will perform a physical examination, take X-rays, perform blood tests and use other diagnostic tests to investigate the cause of the disease.
It may be difficult for the vet to observe any symptoms of arthritis during the visit, so it is essential to recount your own observations of any signs or subtle indications that your cat or dog may be in pain.
In the physical examination, the vet will look for the following:
- Grinding of the joint, crepitus
- Roughness to the bone, abnormal bone formation
- Swelling, tenderness and pain in and around the joint
- Muscle atrophy
Additional tests may include:
- A radiograph or x-ray, performed under general anaesthetic, can confirm arthritis. In some cases, a contrast dye will be injected into the joint prior to the x-ray.
- A force plate analysis – a special mat with plate sensors and hooked up to a computer is placed on the floor. When the animal walks across the mat, the computer analyses the forces on the plates.
- Joint fluid aspiration to ascertain if the arthritis is degenerative or inflammatory.
Prognosis / Life expectancy…
With a personalised treatment plan that effectively manages pain and inflammation, it is possible for your cat or dog to live a happy and relatively pain-free life.
Treatment for arthritis in dogs and cats
There is no cure for arthritis, as the physical changes that have occurred in the affected joints cannot be reversed. Therefore, cat and dog arthritis treatment is most commonly palliative and entails controlling and managing the pain and inflammation. However, treatment cannot correct the structural damage to the animal’s joints, calcium deposits, scar tissue, missing or torn cartilage or bone changes at the joint.
A personalised treatment plan will be developed for your cat or dog, considering its age, severity of the symptoms, stage of the disease and any other health problems or underlying diseases which need to be addressed.
Some of the common cat and dog arthritis treatment options are:
Prescription pain medications:
- Disease modifying osteoarthritis drugs
- Usually administered as arthritis injections for dogs or cats, these are typically given as a series of four injections over four weeks, repeated every six to twelve
- They stabilse joint membranes, assist cartilage repair and improve lubrication.
- There are minimal side effects to arthritis injections for dogs and cats.
- NSAIDS – Non-steroidal anti-inflammatory drugs
- They reduce inflammation around the joints and provide the cat or dog arthritis pain relief.
- Those designed for humans have a high rate of potentially dangerous side effects, and should not be used for animals.
- Those specially designed for animals are much safer, but occasional adverse side effects can still occur.
- Veterinary supervision is required for the administration of arthritis medication for dogs and cats.
- These include prednisone, dexamethasone and other corticosteroids.
- They can significantly reduce swelling and inflammation in arthritic joints.
- Long term use can cause damage to the joints and other side effects.
- They are no longer commonly prescribed as newer and safer medications are now available.
- A gel-like substance is injected into the joint to lubricate the cartilage.
- These arthritis injections for dogs and cats can improve flexibility and lessen the pain.
- Other cat and dog arthritis pain relief medication
- May be prescribed in severe cases or if other forms of cat or dog arthritis treatment are ineffective.
Nutritional supplements / Nutraceuticals
- Dietary cat or dog arthritis supplements may help protect and repair cartilage and improve joint lubrication, thereby alleviating inflammation and reducing joint pain.
- Glucosamine, chondroitin sulfate, omega-3 fatty acids (fish oil), vitamin E, selenium and green lipped mussel are all commonly used as cat or dog arthritis supplements.
- These supplements are considered to be a natural arthritis treatment for dogs and cats that are safer than traditional drugs as they have minimal side effects.
- They are not a “quick fix” – it may take weeks to months before any improvement is noticeable.
- Natural arthritis treatment for dogs and cats appear to work best when combined with other treatments.
Weight loss, if animal is overweight
- Weight loss is a very important element of managing arthritis in dogs and cats – some believe the most important factor of the cat or dog arthritis treatment protocol.
- Overweight animals are overloading their joints, which contributes to joint inflammation and irritation, accelerating the progression of arthritis and exacerbating the cat or dog arthritis symptoms.
- Gradual weight loss is essential for the prevention of metabolic problems and should be done in a controlled manner under medical supervision.
Moderate, controlled exercise program
- This is another very important element of managing arthritis in dogs and cats.
- Exercise maintains and improves joint flexibility and stimulates the production of lubricating and nourishing joint fluid.
- Exercise strengthens the muscles, tendons and ligaments surrounding the joints, which are then able to provide greater support for the joints.
- Exercise help to maintain normal to lean weight and prevents obesity.
- The exercise program must be introduced slowly and increased gradually.
- Leash walking and/or swimming are highly recommended as part of any dog arthritis treatment plan.
- Avoid uncontrolled activity, such as chasing tennis balls, racing on sand dunes, which places pressure on the ligaments and further damage the joints.
- Allow significant rest periods each day, to encourage healing.
- Provide warm, soft, cushioned bedding away from drafts – this may help to lessen discomfort and stiffness.
- Provide cats with low sided litter trays for easy access.
- Provide ramps or easier access to favourite counters and other raised areas and as an alternative to stairs, if possible.
- Help your cat with grooming activities (trim nails, brush coat).
- There are a number of surgical options that may be recommended as part of the cat or dog arthritis treatment plan, including hip replacements and repairs to torn ligaments. Arthroscopy may be performed to treat cartilage separation, meniscal tears and ligament damage.
- Surgical fusion (arthrodesis) may be performed on advanced cases.
- Physical therapy comprises a range of specific activities designed to improve strength and mobility without putting additional stress on the joint.
- Physical therapy is an essential component of natural arthritis treatment for dogs and cats.
- If surgery has been performed, physical therapy is an important element of post-surgical recovery.
- Physical therapy treatment options for managing arthritis in cats and dogs include:
- Physiotherapy / massage – may help with decreasing scar tissue, improving mobility and reducing pain.
- Hydrotherapy / water therapy – walking on the treadmill while the body is underwater – this increases movement and mobility without putting pressure on the joints and ligaments.
- Low level laser therapy
- Balancing exercises
- Strengthening exercises
In a nutshell
Arthritis in dogs and cats is a chronic degenerative disease, usually resulting from everyday wear and tear on the joints, that is common in older animals. The most common form of arthritis in cats and dogs is osteoarthritis, a degenerative joint disease which can develop into continuous chronic pain in one or more of the weight-bearing joints.
Animals are stoic and try to mask their pain, so it can be difficult to pick up the subtle signs that your pet is suffering. Some of the more common dog arthritis symptoms you may notice include stiffness, limping and weight gain. Arthritis in cats may be more tricky for the owner to detect. Your vet will be able to diagnose whether your dog or cat has arthritis by performing a physical examination and certain tests.
Arthritis cannot be cured, but it can be prevented from worsening and there are cat and dog arthritis treatment options available to ease the discomfort and pain it causes. Arthritis injections for dogs and cats can help to improve joint condition and ease the pain. Arthritis medication for dogs and cats includes a number of natural remedies and supplements that may be beneficial as part of a long-term strategy. Diet and exercise are considered key components of a treatment program and maintenance of a good quality of life.