That roughneck bar from Screwfix is fine if you want to slowly chip away at something hard in your garden but useless at prying.
I'm not particularly strong but I bent mine quite easily trying to move a large rock!!
The steel in it is nowhere near the quality of the old fashioned bars - it's way too soft!
I use Kronch salmon oil on their food - you can buy it on eBay.
My lurcher had exactly the same problem - the salmon oil sorted her coat in less than a month.
I swear by a quick spray of Savlon Dry Antiseptic Skin Healing Powder before the wound starts scabbing up.
It contains iodine and is easy to apply - it dries very quickly so the dog can't lick it off.