There is no easy solution to your torment except to think that you love him enough to let him go. ?
I do know much of what you must be feeling, but in hindsight, much as I would give my right arm to have Paw back again, it would be totally wrong to wish more hours and days of pain and suffering on him.
Take this opportunity for anybody who needs to see him, to visit. Be there with your daughters and if there is one positive to take from this, it is the chance to tell him you love him and to say goodbye. If he slips away in the arms of those who love him best, that is a privilege many of us would wish for.
A hard hard time for you ?