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Both my cats got these huge lumps on their sides from the rabies vaccination this year. Our vet said that they have contacted the manufacturer who assured them it was normal and said it happens quite often. I had never had an animal react until this year though! I think it was right around 2 weeks after recieving the shot-just long enough that I didn't suspect the shot when it first appeared on one cat, causing me to have to take the cat to the vet.