By Bradford P. Smith
By D.C. Blood, with contributions by J.H. Arundel and C.C. Gay O.M. Radostits, J.A. Henderson
By Geoffrey P. West
By Giles Legood
By Ian Ramsey
By Stephen J. Withrow, E.Gregory MacEwen, E. Gregory MacEwan
By Richard E.W. Halliwell, Neil T. Gorman
By C. Hawkey, T.B. Dennett (Photographic Unit, Institute of Zoology, London)
By Ramsey
By Michael Thrusfield
By Trout, Dr Nick
By Dr. John W. Pilley, Hilary Hinzmann
By Vanessa Estrada Marin (Vanessa Estrada Marin), Alisa Harris (Alisa Harris), Frolic
By Angela Aylmore
By W.Edward Allen
By Muir III DVM PhD, William W., Hubbell DVM MS DACVA, John A. E., Skarda DVM PhD, Roman T., Bednarski DVM MS, Richard M.
By Simon J. Wheeler
By A. David Weaver
By Arthur DVSc FRCVS, Geoffrey H., Noakes BVet Med PhD FRCVS DVRep DipECAR, David E., Pearson BVSc PhD FRCVS, Harold, Parkinson BVSc PhD DBR FRCVS, Timothy J.
By George H. Muller, Robert W. Kirk, Danny W. Scott, etc.
By Doxey, D.L.
By Henderson, David C.
By Sidney William Douglas, Hamar David Williamson
By Alexander, Frank
By Andrew W. Speedy
By Allan Fraser, J.T. Stamp
By National Research Council, Division on Earth and Life Studies, Board on Agriculture and Natural Resources, Committee on Animal Nutrition, Subcommittee on Dog and Cat Nutrition
By Marthe Kiley-Worthington
By VV, AA