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August 03, 2017
As we know well, as we age our joints become a little less flexible and sometimes painful and aching. This is also very true for our dogs, and can affect over 50% of dogs aged 7 or more.
Articulated (or movable) joints are enclosed capsules where two bones meet. To prevent the bones touching the end of each is covered in cartilage and the space between the two is filled with fluid, held in by a membrane. In a healthy dog the cartilage is pearly white, smooth, soft and flexible, and provides shock absorption during impacts.
Poor nutrition, ill health, disease, injury and especially old age can all cause the cartilage to become brittle, rough and pitted resulting in pain and inflammation each time the two come into contact.
Cartilage is a bit like a wall, with “bricks” called collagen and proteoglycan “cemented” together by sulphur-containing substances. As we move through life this wall is constantly broken down and rebuilt by the body. The problem is that as we age the rebuilding process becomes much less efficient.
Glucosamine and chondroitin can help this rebuilding process by stimulating the production of the “bricks”, and inhibit breakdown of the “cement”.
Good nutrition can help, with foods such as fish being rich in both Glucosamine and Chondroitin. Also, fish contains a high level of sulphur, which further promotes the “cement” production.
Another very important aspect of joint pain, in older animals, is inflammation. As well as friction caused through cartilage damage, infection can also increase inflammation, and hence pressure, around the joint. Also dehydration can cause crystal formation in the fluid, which also irritates the sensitive membranes that encapsulate the joint fluids.
Fish oils are particularly effective and reducing this inflammation and, although they are certainly not a cure, they have also been found to be extremely effective at reducing the painful symptoms of conditions such as rheumatoid arthritis.
To minimize the occurrence of joint discomfort further it is also important for your dog to have a diet containing balanced amino acids. Fish and meat are particularly suitable for this. An imbalance in amino acids means that the dog has to modify and then excrete any excess. This process generates the compound ammonia which circulates in the blood until removed by the kidney, after conversion to urea. If the concentration of blood ammonia is particularly high, or the efficiency of its excretion is reduced due to kidney problems, e.g. in older age, this ammonia can crystalize in and around joints, causing pressure and inflammation.
So in summary, to ensure our dogs are active and happy well into later life, it is important to provide a diet rich in glucosamine and chondroitin, with a good level of omega-3 oils from fish, and digestible protein with balanced amino acids.
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