Dogs needing change of lead and restraints (7)
I believe the answer is:
fetters
'restraints' is the definition.
(fetter is a kind of restraint)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for fetters that I've seen before include "Irons, chains" , "Restrictions" , "Bonds" , "Chains - shackles" .)