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Hello and thanks for trusting me to help you and your pet today. I am a licensed veterinarian with over 25 years experience and would be happy work with you.
There is nothing harmful in giving the gaviscon, but a more beneficial antacid may be one of the gastric acid blocker type products like Pepcid AC (famotidine). Often the anorexia seen in kidney failure is due to gastritis and an antacid may help. We usually dose at about 1 mg per pound that your dog weighs (and round down) to an available size that is available. This can be given twice a day.
You could also talk to vet about prescribing an appetite stimulant. Many of these dogs will also feel better and eat better if you are able to give fluids under the skin at home to feel the kidney values down. This is something that is usually easily taught and most dogs tolerate very well.
I would not advise using apple cider vinegar at all. Most dogs in kidney failure are a little acidotic (blood pH is too low) and the vinegar may only make that worse.
Here is a link with more information about fluid therapy at home.
I hope that this is helpful.
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The changes in food offered has little to do with her not wanting to eat. With kidney failure patients, it is more a consequence of the kidneys not keeping up with removing the metabolic waste from the blood and those rising levels lead to nausea and anorexia.
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Good luck with her.