Obligatory: don't shave your single-cost dog too close (sunburn) and don't shave double-coat breeds at all (heats them up and ruins their winter coat)!
Can I just clarify: is my scruffy lurcher double coat? Was just about to trim* all the long bits off, it's a bugger to brush and I met a trimmed one recently whose coat was just so nice to the touch in comparison.
Obligatory: don't shave your single-cost dog too close (sunburn) and don't shave double-coat breeds at all (heats them up and ruins their winter coat)!