What Are the Causes of Enlarged Pupils in a Dog?

- Eye disease: This can include any conditions affecting the structure or function of the eye, such as glaucoma, uveitis, and retinal detachment.

- Neurological disorders: These can affect the nerves that control the size of the pupils, leading to dilation. Examples include brain tumors, head trauma, and seizures.

- Certain medications: Some drugs can have the side effect of dilating pupils. These include atropine, scopolamine, and phenobarbital.

- Toxins: Exposure to certain toxins, such as organophosphates and heavy metals, can also cause dilated pupils.

- Emotional states: In some cases, dogs' pupils may dilate when they are excited, fearful, or alert.

- Pain: Severe pain can also cause dilated pupils in dogs.

If you notice that your dog's pupils are dilated, it is important to take them to a veterinarian for evaluation to determine the cause and receive appropriate treatment. The veterinarian will perform a thorough examination, including an eye exam and neurological assessment, and may recommend additional tests, such as bloodwork or imaging, to identify the underlying cause.