I hope your Winston is better soon.....vomiting is one of the many reactions with this vaccine......The rabies vaccine has the highest risk for reactions ..... Once this happens the risk sometimes increases with the next one.....
Report any reactions you believe might be linked to any shot to your vet immediately. Make sure it goes in your dog's file and get a copy. You may someday need to apply for a vaccination exemption. Be sure lot number and the name of vaccine manufacturer is written on the chart. Contact the vaccine manufacturer, with the lot number.....
On-line reporting form:
https://web01.aphis.usda.gov/CVB/adv...0Form?OpenForm
You'll need to get a lot of the information from your vet. Do not expect your vet to submit the report. Underreporting is commonplace.
This might have some helpful info for you....
Vaccinating Dogs: What Your Vet Hasn't Told You