Lawn Aid Chews For Dogs. A daily formula for dogs to prevent unsightly lawn spots. Lawn Aid helps normalize ammonia and nitrogen concentration in the urine and supports bladder and urinary tract health. Yucca Extract-Regulate odors by altering the production or availability of hydrogen sulfide. Cranberry-Supports normal urine pH. Methionine-An amino acid that helps maintain normal ammonia production-the chemical that can cause lawn burn. Contains sixty chews within one 7x4-3/4 inch bag.