Banfield Pet Hospital and VCA Animal Hospitals sell them directly through their official online shops. :
* This product is available by prescription only. * Due to federal and state laws, we cannot accept returns on prescription items. Revival Animal Health Sentinel Flavor Tabs for Dogs Rx - Fetch Pet Rx where to buy sentinel flavor tabs
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You can buy from several major pet retailers and specialized veterinary pharmacies. Because this medication is a prescription-only heartworm and parasite preventative, any retailer will require verification from your veterinarian before shipping your order. Where to Buy Sentinel® Flavor Tabs - Banfield Shop Banfield Shop | Sentinel® Flavor Tabs® Banfield Pet Hospital Sentinel® Flavor Tabs - Revival Animal Health Revival Animal Health Sentinel Flavor Tabs for Dogs