I am so sad for you and the pup reading about this. I don't have any ideas. I have one cat Bobby who had allergy tests and injections. I gave them to him here at home, for one year, and he has been fine ever since, for 5 years now. But I know we did not have any issues as we started the shots!

Paws crossed this effect is short term and things work out. Maybe some others on here will have advice for you.