Heartland Vet Supply is a Vet-VIPPS accredited pharmacy offering a range of pet supplies and prescription products for cats, dogs, and horses. They provide discounted pricing on popular products such as Vetmedin, Frontline, and Heartgard, with free shipping on qualifying orders. The company aims to help pet owners care for their animals, offering a variety of products and promotions, including a site-wide discount with code TWITTER.