Puppies survival questions

Besides the mother be in 100% and pupsitter boost has another way to increase the pup survival?

And if the survival rate of a puppie are not 100% it will die in next rollover or loses survival rate?

Because I have 3 puppies with 87% (survival rate + pupsitter + mother boost) and one with 81% (survival rate + pupsitter + mother boost). They born today and are from same mother (relatives - 3 F and 1 M). I don't want to they die.

Mother should have 100% hunger and 100% mood (latter only if its not your lead wolf). They will not die for sure, they just have that chance. They will increase their survival rate at the next rollover if mom is at 100% in hunger and mood, and the pupsitter boost will increase as the pupsitter gains proficiency. 87% and 81% are pretty good chances, but if you're really worried about it you can assign another pupsitter. 

(deleted cause I was wrong)

I want to post a CORRECTION: 

Apparently boost/penalty rolls before death.

Oh. Thanks to all. :)