Your husband absolutely needs to be seen by a doctor -- now, if he hasn't already. If needed, go to the ER. This is not something to wait on, and is certainly not an issue to ignore. Drag him, kicking and screaming, if you have to.
It could just be a hemorrhoid, but it could also be very serious.
your husband absolutely needs to see a physician, in particular a gastro. there can be blood in the stool for lots of benign reasons, but it also can be due to a more serious medical reason. you can't ignore the possibility of a colon tumor, even if it's the LEAST likely reason. i always feel like i have to give everyone a warning re blood in stools: we have a family friend who ignored such warning signs for a long time, and he's lucky to be alive. he now has a colostomy bag, which possibly could have been avoided had he consulted a doctor earlier. it's most likely something less serious, but please get your husband to a doctor.