达拉斯·坎贝尔

Dallas Campbell

饰：Himself - Presenter

Michael Borer

饰：Himself - Zoologist

Phyllis Croft

饰：Herself

Adam Miklosi

饰：Himself - Eötvös Loránd University

Clare Rusbridge

饰：Herself - Veterinary Neurologist

Jeff Sampson

饰：Himself - Genetics Co-ordinator, The Kennel Club

Lyudmila Trut

饰：Herself - Institute of Cytology and Genetics

Eric Zimen

饰：Himself - Zoologist

John Bradshaw

饰：Self - Author, 'In Defence of Dogs',(as Dr. John Bradshaw)

马克·埃文斯

Mark Evans

饰：Chief Vet, RSPCA,(archive footage)