We cannot figure out what happened!! This has managed to appear on Loki's neck in what seems like overnight. My husband was playing with him yesterday and we found it after I spotted blood on hubby's leg! Loki is strictly an inside dog and doesn't spend a whole lot of time outside right now due to it being too hot... He has a vet appointment in the morning to have it looked at, and we are keeping our fingers crossed that it isn't some sort of mange Does anyone know or have any suggestions as to what could have caused this??