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Sentinel Spectrum the only beef-flavored chewable to protect against 6 parasites. Given monthly Sentinel Spectrum prevents heartworms and prevents and controls fleas. Each chew also treats and controls whipworms hookworms roundworms and tapeworms. Sentinel Spectrum requires a prescription from your veterinarian. Indication: Monthly treatment prevents heartworm Dirofilaria immitis infection; controls adult roundworm Toxocara canis and Toxascaris leonina immature roundworm Toxocara canis adult whipworm Trichuris vulpis adult hookworm Ancylostoma caninum adult tapeworm Echinococcus granulosus Taenia pisiformis and Dipylidium caninum aids in the control of adult hookworm Uncinaria stenocephala infection provides long term protection and control of flea Ctenocephalides felis infestations and forms part of a treatment strategy for flea allergy dermatitis in dogs. Flea allergy dermatitis FAD. The most important part of the treatment of FAD is preventing flea bites. Lufenuron reduces the number of fleas in the pet’s environment to a negligible level. Treatment with lufenuron for several months has been shown to dramatically improve the clinical signs of FAD in dogs. How It Works Milbemycin oxime lufenuron and praziquantel are the active ingredients in Sentinel Spectrum which work to control fleas major intestinal worms and heartworms. Sentinel Spectrum contains an insect growth regulator IGR which kills flea eggs thus preventing them from hatching into adult fleas. Sentinel may be given along with Capstar which treats flea infestation. Sentinel Spectrum is a registered trademark of Intervet Inc. d/b/a Merck Animal Health a subsidiary of Merck Co. Inc.