Zebra: When guide dogs go bad
This was a motif in late 1970s/early 1980s Italian horror films for some reason - I can think of at least two (Suspiria and The Beyond, for anyone who cares) that featured possessed guide dogs turning on their hapless owners.
I too am going to hell, as it's impossible to read that story without suppressing a giggle - and now that I've been reminded of The Beyond I know what hell looks like. (A lot of unconvincing painted backdrops and shuffling zombies, as I recall, so not that much different).