I have just been through the very same with Cassie. (see thread Problems with booster )
She is now 3 and at her first booster she reacted just the same as Cuper, her head just ballooned. Our vet gave her a different injection (Nobivac) last year which she was fine with. BUT this year they refused to buy in Nobivac saying they were loosing money and I should find another Vet. I couldn't find one that kept Nobivac
After much soul searching and discussing this on this forum I decided to go to another vet and go ahead with a different make of booster ( although many advised Titer testing rather than a booster) some years ago I had a little pup die from Distemper and this weighed heavily on my decision. Also Cassie comes into contact with dogs from all over the country and France and Spain (if not the actual dogs ,their pee and pooh !!!)
To cut a long story short Cass was injected yesterday, I was sick with worry. We stayed close to the vet anticipating a reaction, for over an hour .... THANKFULLY there was none. The new vet was very supportive and his Nurses even more so.We don't live that far from the vets so thought if anything happened I could get back quickly I must have followed Cass all over the house for at least two hours keeping an eye on her !!!!!!
As someone said here, the decision has to be yours but I felt between the devil and the deep blue sea, what is best well........ we all have a different opinion but all have our dogs best interests at heart and I am grateful for the advise and interest that others on here give
You will do what is best for Cupar