For Medium to Large Water Bowls Pets Do All the Work...Not You! Natural Products for Pets Odorless Colorless Tasteless Will Not Change Pet's Drinking or Eating Habits For Dogs and Cats Quality Seal NASC - Natural Animal Supplement Council Yeast Free Wheat Free Corn Free Ends...Hand brushing, wipes, sprays, gels, paste and jumpy animals. Goodbye...Plaque, tartar, bad breath and stained teeth. Hello...Pet's healthy teeth and sweet breath. For use by dogs and cats 12 weeks and older. To support dental health & control plaque, tartar and bad breath. Plaque-Zapper contains naturally available enzymes that are activated by mouth saliva. As your pets drink from their water bowl. Ark's Plaque-Zapper "zaps" harmful mouth bacteria. Our clinically tested enzymes stop plaque from sticking to pets' teeth.