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Why is My Puppy Running into Things and Having Dilated Eyes After Vaccination?


Dear VetBabble,

My puppy received a vaccination yesterday and an oral medication for worms this morning. He woke up running into things as if he couldn’t see, and his eyes are dilated. What should I do in this situation, and what could be causing this issue in my puppy?


First of all, experiencing changes in your puppy’s behavior and vision can be quite concerning, and we understand your worry. There are several possible reasons for these sudden visual changes, and while we can’t diagnose the exact cause, there are both immediate and preventative steps that you should take to ensure your puppy’s well-being. We have broken down our response into three sections for your convenience: immediate action, potential causes, and general precautions.

Immediate Action

If your puppy appears to have lost vision and is experiencing difficulties navigating, it is essential to take him to the veterinarian as soon as possible. Sudden vision loss requires prompt attention, as it could indicate a severe underlying health issue. While it is possible the oral medication or vaccination contributed to these symptoms, your veterinarian should assess your puppy’s overall health and determine the cause. Early intervention is critical, as some vision problems may be reversible if addressed quickly.

Potential Causes

Vision Problems: The symptoms described could be related to various eye conditions, as vision impairment in dogs can stem from numerous sources. For example, a common cause of sudden vision loss in dogs is Sudden Acquired Retinal Degeneration Syndrome (SARDS). In addition, Common Eye Conditions in Dogs can provide more information on other possibilities that could affect your puppy’s vision.

Oral Medication or Vaccination Side Effects: Depending on your puppy’s specific condition and medical history, it could be possible that the symptoms are related to the oral medication or vaccination. Every dog reacts differently to medications, and some may experience side effects. It’s essential to monitor your puppy closely after any treatment, inform your veterinarian of any concerning behavior, and inquire about potential side effects.

Heartworm Prevention: Although it’s not mentioned whether the oral medication was given for heartworm prevention, ensuring your puppy has consistent and timely heartworm prevention is essential. If the heartworm medication was given late, complications could arise. For more information on navigating this situation, visit our article: My dog was given heartworm medication late, what should I do?

General Precautions

Parasite Prevention: Ensuring your puppy is protected from parasites like fleas, ticks, and worms is a vital component of keeping your dog healthy. To learn more about protecting your dog from fleas, ticks, and worms, visit Simplifying Fleas, Ticks and Worms. Moreover, for information on preventing and treating worms in dogs, consult our article: How to Prevent and Treat Worms in Dogs.

Regular Vet Checkups: Routine vet visits play a significant role in maintaining your puppy’s overall health. During checkups, your veterinarian can monitor your puppy’s development, screen for potential issues, and ensure they receive appropriate vaccinations and preventative care. Staying proactive can help catch and resolve any health concerns before they become more severe.

In conclusion, seeking immediate veterinary care for your puppy’s sudden vision loss is critical. Your veterinarian will be able to identify the underlying cause of the issue and provide guidance on the appropriate course of action. Remember, the health and well-being of your pet is important to us, and we strive to provide the information necessary for you to make informed decisions about their care. Stay informed, and take the necessary precautions to protect your puppy and ensure their lasting health.

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