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the high the protein the harder the kidneys have to work. This is all personal preference but I would not feed the higher protein foods...

Not true PK...Here is what I found....

PROTEIN EXCESS
So what happens when there is too much protein in the diet for a dog's needs?If extra energy is required for, say, performance or lactation, excess protein is metabolised and converted to energy. Otherwise it is converted to fat and stored as energy in the body. Unlike fat and carbohydrates, excess amino acids are not stored for later use. During normal protein metabolism, a nitrogen waste product, urea, is formed and excreted in urine.

Some people are concerned that excess protein or high-protein diets can cause kidney problems. A lot of early research into protein and its effect on the kidneys was carried out in rats, which led researchers to suspect that feeding high levels of protein over long periods of time could lead to chronic kidney disease.As a result, it was common for protein-restricted diets to be recommended for older animals and those with kidney disease. However,in contrast to rats, there is no conclusive evidence that protein intake contributes to kidney dysfunction in healthy dogs. It has also been suggested that older dogs experience reduced kidney function as a normal consequence of ageing, but so far research has not supported this idea either.

Having said that, it is still important to moderately restrict protein in dogs that have high levels of urea in their blood, which implies that the kidneys are not excreting urea wastes properly. If a dog is diagnosed with kidney disease, moderate protein restriction can help alleviate clinical signs. However, it is equally important not to cause a protein deficiency in such dogs. Infact, restricting protein levels in older dogs can actually be detrimental. Protein deficiency can compromise the immune system bringing about infections and poor health; it can also lead to anaemia and muscle wasting. It is not uncommon to see older dogs with poor skinand coats suffering protein deficiency. Lower protein diets are also less palatable, so a vicious cycle can begin with a reduced appetite for the diet. Dietary protein in geriatric dogs should not be restricted simply because of age; their diets should contain adequate levels of high quality protein.
 
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