SynergyLabs Synergy Fooey! Ultra Bitter Gel, 4.25 oz. BITTER TRAINING AID SPRAY: Fooey! is so disgustingly bitter, we actually have a registered trademark to say it's "the most bitter stuff on earth!" When used in conjunction with recommended training methods, Fooey! stops dangerous and destructive behaviors such as: unwanted chewing, licking, biting, ingesting and more. SAFE FOR THE SKIN: Fooey! is pH balanced and safe to use even on pet's skin if needed, to prevent damage to surgical sutures, and to discourage gnawing on hot spots and inflamed areas. Fooey! is the more fashionable option over typical head cones - which we all know, dogs just hate. Alcohol-Free. Safe to Use on the Pet. Neutral pH. Non-Flammable. Non-Acidic. Non-Caustic. Fragrance-Free. Color & Dye Free. Won't Stain. 10 x's More Powerful Formula than Competitive Training Aids. Affordable. Guaranteed to work on most dogs, cats, horses, ferrets, rabbits and birds. Glide Fooey! Gel on anything  and youll instantly transform it into an utterly distasteful object. Works on most dogs, cats, horses, ferrets, rabbits and birds