Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to diagnose keratitis in cats [title] Take your cat to the vet. [step] If you suspect that your cat has keratitis, take him to the vet immediately. Leaving keratitis untreated can lead to severe eye damage which may result in blindness.

Ending1: [substeps] Common symptoms of keratitis include swollen or irritated eyes, discharge from the eye, and discoloration of the eye. Though eye irritation might be due to multiple conditions, or caused by a variety of triggers, any eye problems in your cat should be seen by a vet. Ending2: The easiest way to make sure your cat is healthy is to take him to a vet. Signs of keratitis in cats include : [substeps] Licking the eye a rapid right approach behavior tense shaking [title] Look for swelling. Ending3: In addition, there are other conditions which can lead to blindness, such as ear, eye, or mouth allergies. It is important to take your cat to the vet immediately if you suspect keratitis and cannot rule out other conditions. Ending4: On the other hand, even if your cat is well enough by the time you are sick you should still take him to the vet. If the vet suspects keratitis, they may not be completely sure how to diagnose the disease.

Answer format: ending1/ending2/ending3/ending4