The Werepuppy and the Werepuppy on Holiday by Jacqueline Wilson
Two brilliant books in one!
'He can't help being a bit wild, Mum. He's not like other dogs.'
A scary werewolf video leaves Micky terrified of dogs and Mum decides the only answer is to get Micky a puppy of his own. But when they go to the kennels to choose a puppy, Micky doesn't pick the smallest, the cutest, or the quietest dog...but for some strange reason is drawn to Wolfie - who turns out to be a werepuppy!
Wolfie turns out to be LOTS of fun and also lots of mischief! So when Micky's family decide to go on holiday, Wolfie is banned from going. Micky is distraught. What fun is a holiday without Wolfie?