Sales talk - and he's ingratiating himself with the dog (6)
I believe the answer is:
patter
'sales talk' is the definition.
(sales patter)
'he's ingratiating himself with the dog' is the wordplay.
I cannot really understand how this works, but
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is present in the answer.
'he' could be 'pate' and 'pate' is present in the leftover letters.
A single letter 'r' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
'and' acts as a link.
Can you help me to learn more?
(Other definitions for patter that I've seen before include "Light tapping sounds as of little feet" , "The sound of steps - of little feet?" , "conjuror's monologue" , "Rapid glib speech, perhaps from salesman" , "idle talk" .)