What a nice ending for Kenzie.
I'm betting Gizmo will also come out of this as good. I found this.
How to induce vomiting Giving your dog a mixture of hydrogen peroxide and water can induce vomiting. Mix the regular Chemist strength of hydrogen peroxide (3%) with an equal part of water, but do not attempt to pour it down your dog's throat, as that could cause inhalation pneumonia. Instead, simply pull the dog's lips away from the side of his mouth, making a pocket for depositing the liquid. Use at least a tablespoon of the mixture for every ten pounds of your dog's weight. Once the mixture has been given, he will begin to vomit in about two minutes. When his stomach has settled, give him a teaspoon of Epsom salts in a little water, as this will empty the intestines quickly. The hydrogen peroxide, on ingestion, becomes oxygen and water and is harmless to your dog; it is one of the best antidotes for phosphorus, which is often used in rat poisons. After you have administered this treatment to your pet, rush him to your veterinarian for further care. (If you have any doubts it is best to seek veterinary advice first.)
http://www.k9dogs.co.uk/Medical.htm