It wasn't easy but my vet suggested giving him a few days to see if he improved from the stroke but he didn't and he was suffering so I knew it was the right decision but that didn't make it any easier.
One of the hardest things I've ever had to do was to have my dog put to sleep after he had a massive stroke. i had him for 12 years, ever since he was a puppy and I held him and petted him as the shot put him to sleep and I went home and broke down crying but I couldn't let him die alone with strangers.