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Question:

What happens if a cat gets vaccinated twice for the same thing?

I'm feeling really stressed and could use some advice. So, I messed up big time with my fur baby, Whiskers. I took him for his annual vet visit last week, and in all the chaos, I didn't realize they gave him the same vaccination twice. I’m freaking out because I've read some conflicting stuff online about what might happen. So far, he's acting totally normal, playing with his toys and demanding treats as usual, but I can't shake this nagging worry that something might go wrong. Has anyone else been through this? Should I be watching for any specific symptoms or side effects? Please let me know if I should rush him back to the vet or if there's a way to manage this at home. Thanks in advance for any help!

Answer:

Hello there! It's understandable to worry if your cat accidentally receives the same vaccine more than once. Generally, most cats tolerate repeat vaccinations well without any severe issues. Vaccines are designed with a wide safety margin, and getting an extra dose is often similar to receiving a booster shot.



However, keep an eye out for mild side effects that can occur after any vaccination, such as slight lethargy, mild fever, reduced appetite, or tenderness at the injection site. These symptoms usually resolve within a day or two.



If your furry friend exhibits more serious signs like persistent vomiting, diarrhea, difficulty breathing, swelling, or if they seem unusually distressed, these could indicate an allergic reaction or other complications, and you should seek veterinary care right away.



At home, ensure your kitty stays comfortable and hydrated, and monitor for any changes in behavior. Providing a quiet and warm space can help them relax as they recover.



For peace of mind and to get personalized advice, it might be helpful to schedule a video consult with one of our vets here at Dial A Vet. We'll be happy to guide you with any concerns about your cat's health.

Answered by

Louise - Senior Veterinary Nurse, Dial A Vet

June 24, 2025

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The "Ask a Vet" forum on Dial A Vet offers general information and helpful tips on pet health, but it's not a substitute for professional veterinary care. The advice here doesn't create a veterinarian-client-patient relationship, and our vets can't diagnose or treat your pet remotely. For emergencies or specific medical concerns, always contact your local veterinarian immediately. Your pet's health is unique, and decisions should only be made after consulting with a qualified professional. By using this forum, you acknowledge these limitations and agree to seek in-person veterinary advice for all your pet's health needs. View our content guidelines.
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