Our mixed breed (no idea what, maybe some Lab, rescued as a stray pup in Israel) 13 yo old girl is being PTS tomorrow. Her hips gave out on her some time back, so bad now despite heavy medication that we've finally reached the point where we have to let her go.
The thing is, on Friday she was so bad that we were absolutely sure in our decision, but since then she has been much perkier the last couple of days. So now I feel sick that we might be doing this too soon. On the other hand, she's still in pain even if better than on Friday, and wouldn't it be better to let her go while she's in a not-so-bad phase, before she gets worse again?
The vet said that if you think it's probably time, then it probably is time.
So hard to know what's best. 
Our other dog had a brain tumour a couple of years back, at the end he wasn't DDog any more, just a furry robot
, so we were 100% sure the decision was the right one when we had him pts.
But this time, it's agonising that we might be letting her go too soon.
Please talk me through this!