> Anyway I once took in a Liver GSD although people told me he was Belgian...
oops I don't mean to laugh but.... I have seen "Belgians" advertised which were just black GSDs, black GSD crosses, white GSDs, anything that looks a bit like a GSD but is odd coloured or a bit unusual.... basically any variant on a GSD theme. It's a convenient tag these days it seems.
My brother-in-law's late mum used to breed GSDs in the 1970s and she knew of livers cropping up back then, also blues. She took an interest in the odd ones because she was also an early breeder of Tortie point Siamese and Si-rex Cornish rex cats.
Just to add, in the early days on Belgians (I mean 1890's) solid black shorthairs and some variations were recorded but never liver or blue or "white". It seems there are blue Malinois in the USA within working lines but as some of those working lines have been crossed into Dutch Sheps, kind of debatable. Within show lines of belgians it's almost unheard of to get blue, pops up a lot less than it does in GSDs if ever... liver was never in the original gene pool... neither was 'white'.