Mark Raycroft / Brittany Spaniel (Canis familiaris) with training bumper

LYNN M. STONE / Two black female Labrador Retrievers fighting over training bumper on beach, Rhode Island, USA

LYNN M. STONE / Head portrait of Golden Retriever swimming, retrieving training bumper, Illinois, USA

LYNN M. STONE / Young Golden Retriever swimming with training bumper, Connecticut, USA

LYNN M. STONE / English Springer Spaniel sitting in prairie grass, holding training bumper (pigeon) Elkhorn, Wisconsin, USA

LYNN M. STONE / Yellow Labrador Retriever plunging into stream to retrieve orange training bumper, Illinois, USA

LYNN M. STONE / Yellow Labrador Retriever with orange training bumper, splashing out of pond, Illinois, USA

LYNN M. STONE / Chocolate Labrador Retriever swimming in pond, retrieving training bumper, Connecticut, USA

LYNN M. STONE / Domestic dog, two black Labrador Retrievers sharing retrieve of orange bumper in pond during training exercise; Hebron, Illinois, USA (GW)

Mark Raycroft / Golden Retriever (Canis familiaris) adult with training bumper

Mark Raycroft / English Springer Spaniel (Canis familiaris) with training bumper

Mark Raycroft / Chesapeake Bay Retriever (Canis familiaris) in wetland with bumper during training exercise

Mark Raycroft / Chesapeake Bay Retriever (Canis familiaris) pup retrieving bumper during training

Mark Raycroft / Flat-coated Retriever (Canis familiaris) retrieving bumper in harvested corn field

Gerry Ellis / Firewood hauled from clearcut on truck bed with 'I Love Spotted Owls, Fried' bumper sticker, Suislaw National Forest, Oregon

Jim Brandenburg / Truck with anti-wolf bumper sticker, Virginia