I'm going to break this down into a schedule to make it easier to understand.
Normal day. Horse is moving normally, had a good ride, acting normally etc.
Horse gets usual chiro work, turned out and walked around beforehand to get him loose and supple for the work.
Horse gets Flu Rhino vaccine.
The vet advises us that they can sometimes react to the vaccine by being sore, so I opt to lunge.
Lunging, he is not moving like yesterday. He is more resistant to reaching down and seemed to struggle to hold a canter. However, he was still moving fairly forward.
Horse develops welt on his left rump where shot was received.
Horse has no shavings on him in the morning, meaning he did not lie down that night. He typically lies down every night.
Horse is not eating well, leaving half of his lunch over before finishing it and same with dinner. Also not drinking as much.
Horse seemed exhausted for no reason, very sullen.
Horse became grumpy when made to walk up a hill on the way back to the barn, which is unusual for him. Did not want to walk up it.
I opted for free lunging tonight, just at the walk since he seemed so sore. Extremely noticeable soreness at the walk, struggled to get any sort of forward walk without him looking uncomfortable.
Horse pawed like he wanted to roll, but did not roll. This happened at least 4 times.
I checked his digestive system via gut sounds and poop and everything seemed normal there, so I know it isn't a stomach related issue.
I gave him one gram of bute to help, seemed a bit brighter an hour later.
So, here are my questions:
What can I do to help him through this?
Is this some sort of mini-flu, or is it caused just by the soreness?
Should I call the vet and talk to her?
More importantly, is this vaccine worth the risk for him to get it again next year?
If he needed to get it next year, is there any way that I could reduce the damage?
Thank you for any advice.