Small bite on dog, maybe bit (7)
I believe the answer is:
snippet
'bit' is the definition.
(I've seen this before)
'small bite on dog maybe' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'bite' becomes 'nip' (nip is a kind of bite).
'on' is a charade indicator (letters next to each other).
'dog maybe' becomes 'pet' (dogs are often kept as pets).
's'+'nip'+'pet'='SNIPPET'
(Other definitions for snippet that I've seen before include "Small fragment" , "Small extract" , "Short extract" , "Small scrap" , "Brief extract" .)