Greencross was founded in 1994 by veterinarian Glen Richards. While practicing companion animal medicine and surgery in Townsville, he purchased Currajong veterinary hospital. This was the start of Greencross. The company expanded by purchasing and consolidating veterinary services through Australia and went public on the Australian Securities Exchange in 2007, becoming the first veterinary practice in Australia to do so. One of its largest acquisitions took place in 2014 with the purchase of Mammoth Pet Holdings, the parent of Petbarn and Animates chains in Australia and New Zealand.