Paddy, yes you are correct about the Greenland dogs. They howl. They are the 'wildest' of the sled dogs, the others are 'people friendly' and live in and around peoples 'camps'. Theyare often used as 'hot water bottles', especially the Husky. It is the most 'people friendly' of the sled dogs.
They ALL howl, some more than others. The Samyod is also used by Indigenous people as a guard dog for their herds, so will bark more than the other breeds.
The Malamut usually will both bark and howl, it will howl more if with other dogs, not necessarly Malamuts.
The Husky very rarely barks, it beening one of the dogs with the closest DNA to the wolf, (99.98%), it howls, especially at sunset and sunrise. Like wolves claiming their 'territory' and calling 'pack' together at night.
The Husky is also more like a wolf, in that it can run huge distances but can't pull heavy loads, unlike the others. It's the smallest/lightest of the sled dogs.
It's also a very good hunter of smallish animals. It was mostly 'left' to find it's own food, except in depths of winter. My ones if 'allowed' to roam free in the hills, would on occasion, return and 'regurgatate' mice, rats, hares, rabbits, etc. Like they would do in the wild, to feed rest of 'pack'.
I, on many a night camping with them, when they started howling at sunset, thinking if anyone was camping near by, what where they thinking was going on? We don't have 'wolves' in the UK or Ireland............. On occasion the sound echoed off crags, down valleys, sounded like there was a whole pack of 'wolves' howling' as in a nature programmes. Might not of had a good sleep that night!!! 
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