I'm so sorry for your loss.
A person much smarter than me once said that getting a pet is knowingly and willingly acquiring a small tragedy. They will fill your life until their demise.
Their loss is so profound.
We had to put our 13 yo cat down last week. My 14 yo daughter was crushed. She named her Baby and she slept together.
Our 12 yo old lab is not walking well and hasn't chased a ball in over a year. Her organs are fine but she can't hardly get up from all the damage she did to herself by chasing balls, birds, squirrels etc. with reckless abandon. She has torn up knees and bad arthritis.
We talk a lot about when is the right time. She still can go outside and goes on a walk a day so we are letting her rest most of the day.
It's incredibly hard. But Letting them go is the best thing you can do for them. It is the unselfish choice.
Now they are all running together, free of pain and suffering. Waiting for us to come home.
It's crazy. I believe more in Dog Heaven than I do for humans. They deserve it so much more.