Why can't my dog control her bowels?

I have a labrador husky mix who is fifteen, and in her old age, she's lost control over her bowels. This is natural. Old dogs often become incontinent, like old people sometimes do. If you think there is a serious problem, you should take your dog to the vet. Otherwise, I'd just take care to let her outside as often as possible. Make sure to let her out before going to bed, and try to wake up earlier to let her out.