Each explosive detection dog must undergo at least 20 days of training a year
Police dogs from the Avon and Somerset and Wiltshire forces have been trained to detect explosives in preparation for the 2012 Olympics.
The dogs were trained to perform stadium searches at Bristol City Football Club's ground.
More than 800 dog searches a day are anticipated of deliveries, transport routes and at stadiums during the 2012 Olympics in London.
The joint training ensures the dogs have the same working practices.
Police dogs from Devon and Cornwall and Dorset also took part in the training, which took place in December.
An Avon and Somerset Constabulary spokesman said each explosive detection dog must undergo at least 20 days of training a year to be accredited for active work.
The dogs are trained to search for military and commercial explosives, home made explosives and newer substances, he added.