Endlessly whet top of incisor or canine (4-3)
I believe the answer is:
shar-pei
'canine' is the definition.
(I've seen this before)
'endlessly whet top of incisor' is the wordplay.
'endlessly' means to remove the last letter.
'whet' becomes 'sharpen' (I've seen this before).
'top of' says to take the initial letters.
The initial letter of 'incisor' is 'i'.
'sharpen' with its final letter taken off is 'sharpe'.
'sharpe'+'i'='SHAR-PEI'
'or' acts as a link.
(Other definitions for shar-pei that I've seen before include "Chinese dog breed" , "Chinese dog; I phrase (anag.)" .)