 A follow-up program, "", was broadcast on BBC 4 on 27 February 2012.A Cavalier King Charles Spaniel was shown to be in agony due to a condition known as syringomyelia, which occurs as a result of the skull being too small for the brain.Veterinary Neurologist Dr Claire Rusbridge described the brain as a "size 10 foot that's been shoved into a size 6 shoe" and estimated that up to 1/3 of the breed suffers from this problem.