We've had reactions are our house. I asked our new vet about reactions to shots. What he does when annual shots are administered. He does give a steriod shot plus sends you home with baby bendryl (spell?). This helps/prevents reactions.
2 of my gang throws up.
Also bendryl, helps settle them down from the experience of being at the vets. Allot of times it's the stress of being there etc that brings on reactions.
Something I didnt know.