If your dog experiences side effects from a vaccine, it's important to monitor their condition closely. Common mild side effects include lethargy, mild fever, reduced appetite, or slight swelling at the injection site. These typically resolve on their own within a day or two. However, if you notice more severe reactions such as difficulty breathing, excessive swelling, vomiting, or seizures, you should contact your veterinarian immediately.

Here are some steps you can take:
1. **Monitor Symptoms:** Keep an eye on your dog for any changes in behavior, appetite, or energy levels. Note the duration and severity of any symptoms.
2. **Contact Your Veterinarian:** If side effects persist beyond 24 hours or if they worsen, reach out to your vet for advice. They may recommend bringing your dog in for an examination.
3. **Provide Comfort:** Make sure your dog has a quiet, comfortable place to rest. Offer plenty of water and encourage them to eat if they seem willing.
4. **Follow-Up Care:** Depending on the severity of the side effects, your vet may suggest treatments or medications to help alleviate discomfort.

Always keep a record of your dog's vaccination schedule and any reactions they have had in the past, as this information can be helpful for your vet in future vaccinations.

Remember, while vaccines can sometimes cause side effects, the benefits of vaccination in preventing serious diseases far outweigh the risks. Regular check-ups and open communication with your veterinarian can help ensure your dog's health and well-being.

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Topics covered in this question:

Puppy Care Dog Health Veterinary Care Dog Vaccines Vaccine Side Effects