
There was another thread similar to yours not long ago in FOO
http://www.champdogsforum.co.uk/board/topic/134328.html although that one was for fashionable ones.
Boots I have loved have been Hunter Crowns, had these a good few years and still doing the job. Pro's very tough warm and waterproof, I am very hard on my boots and most of my walking is done on rough hill terrain. Con's, quite heavy if your walking uphill, expensive and limited stock as Hunter stopped making leather field boots but they're still out there.
Seeland Snow Queen. Pro's very very warm, down to -40 ! special tread to stop you slipping in snow, we haven't had snow this year but they certainly stopped me sliding in mud, pretty cheap £80-90, very comfy ( think big pair of baffies ) waterproof and tough.
Con's, not the most attractive looking boot and if i'm really picky I think if you walked on hard pavements a lot the tread would wear down quite quickly. But there are a few similar seeland boots that may have soles more suitable for pavements, the Snow Queens have knobs on the tread and it's these that wear down.
Tuffa Boots Pro's very comfy and look really good with trousers or skirts, option of a wide calf fitting, tread seems long lasting
Con's not that waterproof but they've recently added a proper waterproof boot to the range. expensive