Professional-Feel Liquid De-Wormer for Canine. 4Oz Product Knowledge: Efficient in opposition to huge roundworm in Canine and pups. Prevents re-infestation of Toxocara canis and Toxascaris leonina in Canine and pups. To be used on pups over 6 weeks of age and older; don’t bug a pet underneath 6 weeks vintage. Now not advisable for Canine underneath 5 lb.