About AESC Founded in 2001 to meet the growing need for after-hours veterinary care in the Parker, Franktown, and Elizabeth communities, Animal Emergency & Specialty Center (AESC) has evolved from a small emergency hospital into a leading 24/7 emergency and specialty referral center. What began in a facility of less than 1,000 square feet has expanded into a state-of-the-art, 20,000-square-foot hospital offering advanced emergency, critical care, surgery, internal medicine, oncology, neurology, rehabilitation, diagnostic imaging, and anesthesiology services.