There are several documents available that show how to release a dog from a trap. Please click on the following links to learn more:

Responsible Pet Owners, Wildlife and Traps
(Compiled by Nova Scotia Department of Natural Resources)

Recreationist Guide to Releasing Traps and Snares
(Compiled by Montana Fish, Wildlife & Parks)

Body-Gripping Traps: Identification, Use, and Pet Removal
(Compiled by Wisconsin Department of Natural Resources)