OK thanks She does fine with Heart Worm but two years same issue on vaccines has me convinced one of the two vaccines she can't handle. I give both dogs Tri-Heart Plus for heart worm. I also dose them with Generic Frontline flea prevention every two months. Last dose was about three weeks ago I guess.
Was the reaction last year the same seasonal time as this year? My guy had horrible hives, manic itching three years in a row, in the summer about the same time, never able to isolate it. I concluded it was a seasonal plant or lawn fertilizer, Dr. Young disagreed, LOL, he thought it was ants.
Monthly wormers can be disastrous, too.
Give the dog incredibly safe Panacur [available at Tractor Supply] every 3 months, instead.