For those who have had a pet euthanized, did you ask to have the pet's ashes (urn), or did you have the vet dispose of the ashes?

My pup is going to be euthanized on Tuesday. I was asked as whether I want his ashes (in an urn, perhaps), or would I prefer to have the vet’s office bury his ashes. I told them to have his ashes buried. Now, I am not sure if I would like his ashes or not.

Does having them provide comfort in any way?