24/7 Pet Hospital - Season 1 Episode 5 -

Black labrador Bilko is referred to the hospital as he's had an extreme allergic reaction. Despite treatment by his vet, he appears to be getting worse. Initially stable overnight, he takes a turn for the worse, and his heart rate means staff must monitor him closely. Attempts to anaesthetise Bilko for a scan cause further concern, and the team call in cardiologist Brian to treat him urgently.