Initially we thought he'd fallen off his bike trying yet another daredevil stunt but it turns out Rosie (the dog) bit him. Daddy's first response was to get rid of the dog but the Dr that treated Eli reassured Mummy that this is quite a common injury and not to be too harsh on the dog.
It turns out that Rosie had just been given a bone and Eli bent down next to her to pick up a ball but Rosie thought he was going for the bone. The rest as they say is history.