So sorry to hear that. We lost Dotty who was 15 in November. It was like losing a child & we all still miss her very much. We had her cremated. We have a white rose for her in pot. We had a photo done of her in canvas & it is next to her box of ashes.
So sorry to hear about your cat. Had to have my oldest boy put to sleep last night so know just how you feel. Decided in the end to have him cremated as couldn't face trying to bury him but will get his ashes back so we can find him a resting place at home with us. I know it was a while ago now but I hope you've found the best memorial for your cat too.
I wouldn't worry about crying at the vets. I took my little rabbits in for their Operation and as I left, I turned round to see my boy rabbit's beautiful trusting face looking at me. Cue helpless sobbing. I'm sorry about your cat. Ours is getting to that point too.