When Billy the lurcher – a cross-breed made by mating a greyhound with a terrier — developed a fairly noticeable limp, he had to be sent to the vet. Russell, Billy’s father, posted the video to the Facebook group Lurcher Link Rescue chat, and it quickly went viral. Billy is melting hearts all across the world, much like the “lonely” golden retriever who met his new little sister on Christmas morning. Russell is seen walking on crutches with one leg covered in a serious-looking cast in the video. Russell brought Billy to the vet after noting his limp and paying £300 in fees and X-rays. Billy was merely suffering from sympathy pain, according to the vet, and nothing was wrong with him!