Interceptor Spectrum for dogs weighing between 4 and 11.
INTERCEPTOR® Spectrum is a convenient and simple way to protect your dog against heartworm and the major intestinal worms. One delicious beef-flavoured chew once a month all year round is all it takes to give your dog a lifetime of protection against even the most dangerous worms.
I purchase this all the time and my dogs have been on it for years. Good stuff