So my boy cat has glassy eyes and has been meowing a lot for the past two days. He has been eating well and is also playing with us. I see darkened wet skin around the corner of his left eye but not the right. His water intake has gone up though. Is this sign of trouble? Is he in pain? I checked him out with a visual inspection and also by lightly pressing his tummy area but he didn't show any reaction to that.
Edit: took him to the vet. She said that he does not seem to have any immediate visible problems as such. What's the course of action if we have to determine if he does have diabetes?