Where is miahs pony HorseIsle?

Start by talking to Miah's mum on Saddle Isle.

She will call Miah over, Talk to her.

She will tell you about her shetland, Minty.

Go to the hidden meadows in the forest to the eastern side of her house.

Find Minty, Talk to her.

She is happy to follow you.

Go back and talk to Miah.

HorseCatcher -x-