Credelio PLUS for Dogs 5.5 - 11 kg is the smallest 4 in 1 tasty chew that provides month long protection against ticks, fleas, demodex mites, heartworm disease and intestinal worms. Credelio PLUS is the smallest 4 in 1 tasty chew that provides month long protection against ticks, fleas, demodex mites, heartworm disease and intestinal worms. Credelio PLUS treats and controls deadly paralysis ticks, as well as brown dog and bush ticks. It kills fleas fast, controls flea allergy dermatitis and prevents flea tapeworm infestations. It also effectively treats and controls generalised demodectic mange caused by demodex mites. Credelio PLUS prevents heartworm disease and treats and controls adult & juvenile stages of roundworms and hookworms, and adult whipworm. Safe to use in puppies from 8 weeks of age and from 1.4 kg.