"Oh yeah, an' I still haven't got (IO) yeh a birthday present."
. . . . . .
“Tell yeh what, I'll get (1) yer animal. Not a toad, toads went outta fashion years ago, yeh'd be laughed at - an' I don' like cats, they make me sneeze. I'll get (2) yer an owl. All the kids want owls, they're dead useful, carry (3) yer mail an' everythin'."
(Harry Potter and the Sorcerer's Stone)
(1) and (3)’s yer may be ‘your.’ But (2)’s yer can’t be ‘your’ because of the next ‘an.’ So yer of (2) needs to be indirect objective, yeh, just as in (IO). Might there be some good reason for the writer putting yer in (2)?