Welsh breed of short-legged dog (5)
I believe the answer is:
corgi
'welsh breed of short-legged dog' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for corgi that I've seen before include "Cardigan, possibly" , "Cardigan or Pembroke dog" , "Barker?" , "Dog of Welsh breed, royal favourite" , "Royal canine" .)