Have you mentioned this to the vet? I know with some surgeries in the perianal area there is fecal incontinence for a few days that clears up as the nerves heal.
"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."