So sorry for you loss. Animal's become part of the family so fast its hard to let them go. I had to do the same thing with mine 5 years ago Its a hard thing to do, but you know its the right thing to do. She went off her back legs and was finding it hard to get up or walk, i though id give her a few days to see how she was, but it just got worse. I took her to the vets and she jumped out the car like a 5 month old puppy, i could not belive it. She was running round sniffing everything in sight. Had I made the wrong choice, but i thought i would get her checked out any way. That was the last time she ever stood up, when i got her in to the vets she lay at the side of me and waited to be called in. i had to pick her up and carry her, she just could not stand any more. The vet checked her out and told me the worst, she not going to get better. "But she just been running round out side" i told her. Maybe it was her way of saying, Thank you. I still miss her.
Iv just had my next dog 5 years later as i swore i would never have another one, i did not want to go through that again. My new dog is almost a dead ringer for the last one all bar a white star on her chest, just as daft and just as loyal.
Looking at you photos, you gave it a good and happy home, not all animal's are so lucky, so feel proud about that.