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Hi there. Thanks for the question. Let me see if I can help. Older dogs go through metabolic changes just like older humans. Things that didnt bother them before, suddeny start ti cause a problem. Also they can be more prone to chronic low grade pancreatitis (inflammation of the gut). It may be wise to have your Chow examined by her vet and have some routine bloodwork done to make sure she is not dealing with chronic pancreatitis. Otherwise.... I would recommend continuing with the rice and chicken diet for 10-12 days. Then look for a dry dog food which is primarily rice and chicken (no other protein sources). Here are some examples:
Initially add a small amount of whatever dog food yuo decide to try in with the cooked chicken and rice and gradually decrease the amount of homemade dog food and increase the amount of dry dog food. If you still have problems, defintely have Dori in to see a vet. I hope this helps. Best of luck.