Question - Part 1

Spotted a blind girl with her guide dog on the way to work, and the dog had stopped for a pee... which set me wondering, and maybe some legal-minded blogger can answer this for me...

Is a blind person excempt from fines for dog fouling?

Please... I don't mean to be insulting... please don't think I'm taking the piss... if it sounds patronising, it's out of ignorance on my part.

I just wondered, if you can't see your dog's crapping on the pavement, can the law penalise you for it? Coz I hope they can't... that really wouldn't be fair.