A quick visit to the vet today. £120!
Went for a look at his left ear 'ole as he's been digging his nails in and bleeding from the scratches, previous treatment we've used before hasn't worked this time. Vet had to sedate him as he was getting very agitated and nervous about the vet looking into his ears. Also shaved his knotty lumps of fur from his rear, inner, legs. Came home with a very sleepy dog with chillier nethers and four pills to calm him for a return visit on Wednesday.
Because he gets lots of knotty fur we've been advised to get a cordless trimmer, only £18 and I shall use it on myself too!
Bald GSD anyone?