Barkingdog got it right--the cranberry will not help the sphincter muscles. Either DES or pheylpropanolamine are very effective for spay incontinence. I doubt that either would affect the nasal cancer but your vet would know for sure.
"We are--each of us--dying; it's how we live in the meantime that makes the difference."
"It's not what you gather, but what you scatter that tells what kind of life you have lived!"
"Be kinder than necessary, for everyone you meet is fighting some kind of battle."