- Both CapShield and CapShield Plus start working within 30 minutes.
- 90% effectiveness within the first 4 hours for dogs; 6 hours for cats.
- Safe for pregnant or nursing dogs or cats.
- May be used in conjunction with other products including heartworm preventives, corticosteroids, antibiotics, vaccines, de-wormers, shampoos, collars, & sprays and medallions








