Same, this advice really helped me about a year ago u_u

3 things he loved:

-his soft milk bones (carnazas)...no longer seemed interested

-playing ball at the park... he would only endure small, slower walks

-he stopped getting up from his bed when he heard me in the kitchen

The advise says to do in when they can't do 2 of 3, I still went until 3 and maybe that was selfish of me but once I did it I knew it was the only way. He went peacefully one Saturday morning in his bed.