Yes STRATEGY-T can be used in mares at all stages of pregnancy. Pregnant mares should be treated as normal during their pregnancy taking care not to stress them during treatment. Mares should be wormed two weeks prior to their expected foaling date. Once a mare has foaled, the mare and foal should both be wormed with first foal worming at twelve weeks of age and subsequently every eight weeks so that large burdens are not allowed to develop. STRATEGY-T can be safely used in breeding stallions at any time without adversely affecting their fertility.