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Welcome to JustAnswer! I am a licensed veterinarian and would be glad to help!While other causes are difficult to rule-out based on description alone, your history would be consistent with an allergic reaction.Although at times a source for the reaction is difficult to identify, possibilities include insect bites, medications, contact with new objects, cleaners, etc. that may have irritated the skin. Ingestion of different or abnormal food or objects may also have played a role.Often in these cases we consider treatments such:1) Steroids (Prednisone - LINK HERE)2) Antihistamines such as Benadryl (LINK HERE)Many consider the use of an antihistamine first - such as Benadryl (dosed in dogs at 0.5 to 2 mg per pound (1 to 4 mg/kg) orally two to three times daily ))If this does not help after a few doses, or if you notice worsening of the signs reported above, the veterinarian not only evaluates for other possible causes, but then (if not started already), considers the use of a steroid such as Prednisone.I hope this information helps!Customer :These bumps really look like ant bites where I can see them on his belly. We are preparing benadryl for him now. How long should I expect to wait before seeing an improvement?CriticalCareVet :Typically within a few hours.Customer :ok thanks sir. So it isn't unusual that the welps would look like ant bites?CriticalCareVet :No - it is not unusual