This message is from: [EMAIL PROTECTED] Hello Nancy I use strongid and Ivermectin. I have had my horses poops check for worms and they have none. This combination I have been using for years and have not had any adverse effects. From pregnant mares, foals and the old fellas. It is safe to double dose on these if needed. I have stayed away from quest, because of some of the stories that I have heard. Good luck and what a good question you asked Bonnie Morris
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