TL;DR: Persistent dilated pupils and agitation in cats usually indicate pain, stress, or underlying medical issues and require a veterinary exam within 24 hours unless emergency symptoms like seizures are present.
Why does my cat have dilated pupils and appear agitated?
When a cat experiences persistently dilated pupils (mydriasis) alongside agitated behavior, it is a sign that their autonomic nervous system is in a state of high alert. This can be triggered by external stressors, intense pain, or internal medical issues such as high blood pressure or toxic exposure. In many cases, the cat is feeling a sense of 'fight or flight,' making them act restless, vocal, or even aggressive.
Is it an emergency if my cat has dilated pupils and is acting restless?
- The urgency level for this condition is Medium, and you should contact your veterinarian to schedule an appointment within 24 hours.
- While these symptoms may not be life-threatening immediately, they often indicate significant discomfort or an underlying systemic issue.
- Seek emergency care immediately if your cat is also experiencing seizures, sudden blindness, or an inability to walk.
Why should I take a photo of my cat's eyes for the veterinarian?
- Take a clear photo of your cat’s eyes in normal room lighting to provide a visual baseline for the triage professional.
- Photos capture the exact state of the pupils at home, as cats often hide symptoms or react differently once they reach the clinic.
- A visual record helps the vet determine if the dilation is symmetrical and how it compares to the cat's normal appearance.
Clinical Context (Merck Veterinary Manual)
In a cat presenting with dilated pupils and agitation, owners should prioritize ensuring their own safety by adequately restraining the cat before initiating any first aid efforts. For agitation, diazepam may be considered, but its effects are short-lived. Alternatively, phenothiazine tranquilizers like acepromazine (0.05-1 mg/kg, IV, IM, or SC, repeated as needed) or chlorpromazine (0.5-1 mg/kg, IV or IM) can be used cautiously due to their potential to lower the seizure threshold. If phenothiazines are ineffective, phenobarbital (3-4 mg/kg, IV) or pentobarbital (IV to effect) may be considered. In severe cases, a gas anesthetic such as isoflurane might be necessary to control CNS signs.
Chapter: Emergency, General Principles, Cardiopulmonary
Source: The Merck Veterinary Manual, 11th Edition (Page 1659)