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heredited autosomal recessive trait.
Although a reduced-protein diet is usually prescribed for this condition, the actual experiences of people who have attempted to prevent stone formation with diet have not been positive. And while it is hard for cystine stones to form in alkaline urine (dog urine is normally acidic), maintaining a constant alkaline urine with diet or supplements is difficult, and can lead to the formation of other types of stone. Furthermore, since cystine stones do not dissolve in alkaline urine, if the urine goes into acidity even briefly, stones can form and will not dissolve just because alakaline urine is achieved shortly thereafter. Most of us with dogs with cystinuria have had bad experiences and poor outcomes from relying on diet and supplementation to prevent stone formation in our stone-forming dogs.
buying a puppy, it's important to remember how it's passed on:
dogs are not used for breeding, but in theory it could be crossed
with a free:
buying a puppy, remember to check that its parents are BOTH checked and that
at least one is free!
Source & linkhint: http://www.caninecystinuria.com/