Nova Scotia duck tolling retrievers — Tollers for short — are the smallest breed of retriever recognized by the American Kennel Club (AKC). They’re highly active members of the sporting group.

Pint, a Nova Scotia duck tolling retriever, has retrieved the kickoff tee more than 200 times since 2012. This will be his final season with the team. (Gregory Urquiaga/UC Davis) On the job since 2012 ...