Have used Univac 2 on my dogs for years and have never had a bad reaction but just like humans, they might not feel good for a day and where the shot was given, they may have a sore spot. Every dog is different.
I want to thank Revival for their customer service. Two years ago I made my order, over $80.00. The shipment did not arrive in time, all the vaccines were hot from the ice packs thawing. I had called to ask where my shipment was, that I hadn't received it. They tracked it down and saw it was delayed shipment. They asked when I received the shipment to call them back to let them know if the vaccines were still cold or if hot to touch. Once I received the package, all the vaccines bottles were warm to the touch. I called and was immediately sent new vaccines. Revivial even paid for the return shipment. Thank you Revivial for taking such good care of a customer. Word to wise, never order supplies any where near a holiday and in the hot summer months, always request extra cooling packs.