/b/veterinary-nursing-news/posts/is-this-the-smallest-dog-to-undergo-heart-surgery Cardiologists at Willows Veterinary Centre and Referral Service in Solihull have performed a patent ductus arteriosus (PDA) closure on an eight-week-old Staffordshire bull terrier puppy weighing 2.2kg, believed to be amongst the smallest dogs ever toen-USTelligent Community 10