Note the barking canines, for example (5)
I believe the answer is:
teeth
'canines for example' is the definition.
(canine is a kind of tooth)
'note the barking' is the wordplay.
'note' becomes 'te' (musical note).
'barking' indicates an anagram (UK slang for mad).
'the' is an anagram of 'eth'.
'te'+'eth'='TEETH'
(Other definitions for teeth that I've seen before include "watchdog needs these" , "Gearwheel projections" , "Saw or gearwheel items" , "Bony structures for eating" , "Canines, for example" .)