2A smelly sock, blue cheese and a rubbish bin are just a few of the smells Sniffer finds when he goes for a crafty walk. Pippa Pennington's naughty, but lovable pup, finds himself in trouble when Growler, the big dog from next door, shows up and wants the smelly blue cheese. There's only one choice. Run Sniffer Run A book young children can listen to, and early learners can begin to read.