Germicidal compositions containing one or more N,N-bis(3-aminopropyl) C6-C18 alkyl amines, such as N,N-bis(3-aminopropyl)dodecylamine, and methods of using the compositions for treatment or prevention of infectious hoof diseases are disclosed. The germicidal compositions remain active in the presence of manure, which eliminates the need to pre-clean the hooves before use, and have particular utility for treating or preventing papillomatous digital dermatitis, interdigital phlegmon, interdigital dermatitis, laminitis, white line disease, heel erosion and other hoof diseases.