Milbemax for dogs against heart, coil and tape worms. The composition allows Milbemax to be used preventatively as well. To protect against heart worms, Milbemax should be given monthly, so consult with your vet to discuss whether or not that is necessary. Milbemax "small dogs and pups" if they weight at least 0.5 kg (1/2 tablet) up to 5 kg. Milbemax "large dogs" for dogs weighing at least 5 kg to 25 kg. Worming should be done 4x per year under normal circumstances.