According to Official Guinness Records,
The longest human dog tunnel involved 1,019 people and two dogs in an event organised by the North Northumberland Dog Training Club at the Northumberland County Show, Northumberland, UK, on 25 May 2009.Dogs that were successful: Elsa owned by Jim Wright & Shadow owned by Megan Young.
For a complete list of 2009 records, please visit 2009 Guinness Records in United Kingdom.