PUPILS met Jack and his travelling companions - authors Zoa and Fin Gypsy - on a school visit.
The excited youngsters from Penhale Infant School in Penhale Road, Fratton met the trusty pet - who is part Husky, part border collie and part golden retriever.
Jack accompanies Zoa and Fin on their travels by bike around the world.
He also stars in their Dog Detectives series of books with fellow pet pooch Paco – a Portuguese Podengo.
Jack is the inspiration for Detective Jack.
The travelling trio - who have cycled more than 10,500 miles – are pictured on a trip to Waterstones in Commercial Road, Landport, Portsmouth, where they chatted about the third book in the Dog Detectives series: Lost in London.
The book follows Detective Jack and Deputy Poco Loco as they explore the sites of London.
Publishers Maverick Books said: ‘The Dog Detectives series is written in a unique style, with rhyme, alliteration and upbeat prose. They are written by Fin and Zoa, who have cycled over 17,000km with their two rescue dogs, Jack and Poco Loco who are the inspiration for the series.’