Just looked this up for you
Brands to Boycott
As mentioned above, the main culprits for cruel and unethical animal testing are the major international 'pet' food businesses.
IAMS / Eukanuba owned by Procter & Gamble
Hills Science Diet owned by Colgate Palmolive
The majority of pet food brands available in the UK are produced by two animal testing companies - "Nestl? Purina/Friskies" and "Pedigree, Masterfoods (Mars Inc)."
Nestl? Purina/Friskies: Alpo, Bonio, Felix, Go Cat, Gourmet, Omega Complete, Proplan, Spillers, Vital Balance, Winalot.
Pedigree, Masterfoods (Mars Inc): Bounce, Cesar, Chappie, Frolic, James Wellbeloved, Katkins, Kitekat, Pal, Pedigree Chum, Royal Canin, Sheba, Techni-cal (US & Canada), Whiskas. Pedigree also manufacture Thomas rabbit food and Trill bird food.