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Can you tell me how old your dog is?
Are his stools formed?
Has he been examined by your vet for this yet?
Thanks and I will respond further after you reply. There may be a slight delay while I formulate and type a thorough response or I may be offline, but if so, I will respond as soon as I am able.
Thank you for the reply.
Yes, arthritis can affect a dogs appetite, but I would be worried that there may be something more going on with this degree of weight loss and muscle wasting. If he is not eating normally (even if he is still drinking), he is likely dehydrated by now which will contribute to his gaunt appearance and his anorexia. I would not feel comfortable with just offering pepto bismol when you don't know the cause of his inappetence and it has been going on for so long now.
If he seems painful, there are medications that can be prescribed to help with that, but I would not offer any over the counter type pain meds as many are not safe for use in dogs or can lead to GI upset, which at this point is not what he needs. I would recommend that you have him examined at the earliest you can and perhaps have some bloodwork run to see if there may be a medical reason for his refusal to eat.
I hope this is helpful. Please let me know if you have ANY other questions. My goal is to give you 100% satisfaction and if you are not yet satisfied, please reply so I can clarify for you.
My posted replies are for general education only and not meant as a diagnosis. Only after a thorough veterinary examination can a diagnosis for your pet be made and specific treatments be advised or medications be prescribed.