14 down
Boy
turned
right,
fleeing
alien,
and
spotted
one
with
four
legs
(9)
Boy turned right, fleeing alien, and spotted one with four legs (9)
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The definition is at the end of the clue.
How the clue works
Spotted one with four legs is your definition — a breed of dog famous for its markings. "Boy" gives you LAD, which is "turned" (reversed) to get DAL, then take MARTIAN for "alien" and boot out the R ("fleeing right") to leave MATIAN, and DAL plus MATIAN does the job nicely.