Thanks guys. Your right hydro would irritate all over if it was the issue. I booked into vet but when I got home tonight it looked like it was already healing and he hadnt licked it much. Im going to keep an eye on him and take him in the morning just to make sure he hasnt stepped on something or have an infections.
I appreciate your replies. I will ask vet about fungal infection, grass seeds, bites etc.
He is a border collie. 2 years old.
Cheers!!