hi.. I am not sure how large a mini pin is.. so I took some measurments - thought that it might help..
from the base of the neck the end of the coat is 11" (that does not include the collar)
on the underneath - it is about 9" from the front to the bottom - this is the part of the coat that has the velcrow closing - so that would matter if you had a male dog - the flap that closes is cute because the velcrow doesn't show... it has matching brass buttons like
the coat is sort of like a cape... in shape.. when I open it up... and measure at the end of the velcrow closure... it is 18" in width
the coat of course extends beyond that...
wow.. is this hard to explain.. LOL....
if you have any more questions.. I would be happy to try and answer them..