Thanks for all your help every1! Yes i did think at first that it was maybe him rubbing his legs from him getting up after lying down eventho he has a very thick straw bed with HUGE banks!! But ive physically seen him leaning on the wall scratching! I've check in his fur but no sign at all of mites, have also hibiscrubs it and applied vaseline, etc. I've now been told it cud be caused by straw mites which u cant see and no matter how good quality the straw, they are still there. So as suggested by a couple of u, im gonna get the frontline spray in hope it will help. But the horse in the stable next to me also does it and he is on shaving?!!? Strange! He is fine with his travel boots on, they are not huge bulky ones, just enuf to protect his hocks and backs of his legs. Thanx again peeps! x

I also think it might be mites. It is more common for them to get them in the back of the heels though. I have heard that some people use a product which is good for keeping flees off dogs. the name i am not going to mention though because it isnt licensed for horses. It is VERY commonly used for this though. It is stuff you put on the back of the dogs necks - but you would have to put it on the back of the horses legs of course. NOT on any broken skin though. If you ask your vet he/she might say no he/she cannot supply it for you but he/she might say they can supply it for your dog!!!

He may have mites or lice or something. Have a good rummage to see if there are any little beasties in his fur. Try applying some Savlon (or horsey alternative) to see if it helps soothe the itch. You may have to bathe with antiseptc too so he doesn't get any infection where he's rubbed. Keep an eye on the rest of him to see if he's scratching anywhere else. But as Marybee says, make sure he's not just scraped himself when getting up.