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Hello, JACustomer. I have been a Veterinary Nurse for over 15 years and would be happy to help you today. I'm reviewing your question right now.
1) When was the last time that he had blood work performed with his vet? 2) Any changes in his urination and defecation habits?3) Any changes in food or treats?4) How are his stools?
At 8 years of age, he's old enough to benefit from some blood work especially now that he's starting to show signs of being unwell. At this age we worry about underlying issues where vomiting might be one of the first signs of problem such as kidney disease, liver disease, pancreatitis, diabetes, hyperthyroidism, etc. I would recommend doing this as a first step to ensure that he's healthy.In the meanwhile, you will want to give 0.5mg/pound of body weight (a 10# ***** would receive 5mg, a 5# ***** would receive 2.5mg, etc). For this, you can buy the brand name Pepcid, or you can use the cheaper, off-brand “famotidine” that’s available. Either will be useful. After giving this, wait 2 hours and then offer small amounts of either canned food or pureed baby food in flavors like chicken, turkey, etc. Start small and work your way up. You can use the pepcid as often as is needed to help prevent vomiting and calm the stomach.Please let me know if I can help further.