Roser qualified from the University Autonomous of Barcelona (UAB) in 2006. Following graduation, she completed a Master of Science and a 12-month rotating internship at the Veterinary Teaching Hospital of the same university. She undertook an ophthalmology internship and then a residency at the Animal Health Trust in Newmarket, UK. Roser stayed at the AHT as a clinician for a year before moving to the Royal Veterinary College in London.