Sentinel is a monthly heartworm and flea control pill. Sentinel prevents heartworm disease, controls flea populations, hookworm infections, removes and controls adult roundworm and whipworm infections. It comes in a 6-month supply. A prescription is required. Please fax prescription to 1-800-905-6155 or we can call your veterinarian. You can provide contact information including pet and veterinarian name on the comments part of your order page. Make sure it is OK for us to call your vet. You can also scan and email the prescription. DO NOT order these products before talking to your veterinarian
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