Cow perhaps with shorter legs? (5)
I believe the answer is:
lower
I believe this is a double definition.
'cow perhaps' is the first definition.
(low can mean to make a mooing sound)
'with shorter legs?' is the second definition.
(less tall)
(Other definitions for lower that I've seen before include "Move something down" , "Let down, being inferior" , "put down" , "Bring down" , "Less high in place or position" .)