After years and years of having cats and getting them vaccinated without incident, some of my most recent cats have had reaction to the vaccines. I wonder why? Are they changing the vaccine ingredients, are our cats more sensitive?
Olivia became very lethargic after her kitten vaccines and when we got her one-year booster recently, she was barely awake for about 36 hours. Lily was so sensitive to vaccines—she would be so sick—that we stopped giving them to her at about age 2. She had
kidney disease for most of her life. I wonder if that’s the reason she would get so sick—high fever, extreme lethargy, seriously sore to the touch. It was awful.
We had one other cat before these two sensitive girls, who couldn’t tolerate one of the vaccines—I think it 
was the leukemia vaccine. The vet would give him another shot of something to keep him from getting sick after that vaccine. Winfield ended up dying of injection site sarcoma—a cancer that can develop in the area of the vaccine site. I notice now that veterinarians give vaccines in different spots on the cats’ body to help prevent this sort of cancer—one time in the right shoulder area, next time the left shoulder, maybe in the hips…
Why are so many cats sensitive to the vaccines? Why are they having reactions?
Here’s a site that offers quite a bit of information on this topic. https://www.catster.com/lifestyle/cat-health-best-worst-vaccines-vaccination-cats-ask-a-vet
