A shag is less about one exact length and more about movement. The shape usually relies on layering, a looser perimeter and sections that fall with some separation rather than forming one smooth block.
Short, medium or long?
Short shags can overlap with pixies and bixies; medium shags often show the layered structure most clearly; longer versions keep more weight while still creating movement through the lengths. The best starting point is the amount of length you want to keep, not the trend name alone.
Density changes the cutting plan
Fine hair can lose visible fullness if too much weight is removed, so a shag for fine hair may need fewer or more strategic layers. Thick hair can support more internal movement, but the stylist still has to control where bulk is left behind.
Where to go next
For a short crossover style, see our shaggy pixie guide. You can also browse fine-hair cuts, wavy-hair ideas and curly-hair ideas if natural texture is the bigger deciding factor.