YOU SAID:

if i get 1000 likes on this, my grandpa told me he would get me a mini horse, so mini that i could put it my back pocket

INTO JAPANESE

これで1000いいねをもらったら、おじいちゃんがミニ馬をもらえると言ってくれたので、後ろポケットに入れられるくらいミニ

BACK INTO ENGLISH

Grandpa told me that if I got 1000 likes with this, I would get a mini horse, so it's mini enough to fit in my back pocket

INTO JAPANESE

おじいちゃんは、これで1000のいいねをもらったら、ミニ馬を手に入れると言ったので、後ろのポケットに収まるほどミニです

BACK INTO ENGLISH

Grandpa said that if he got 1000 likes, he would get a mini horse, so it's mini enough to fit in his back pocket.

INTO JAPANESE

おじいちゃんは、1000のいいねがあれば、ミニ馬を手に入れると言ったので、後ろのポケットに収まるほどミニです。

BACK INTO ENGLISH

Grandpa said that if he had 1000 likes, he would get a mini horse, so it's small enough to fit in his back pocket.

INTO JAPANESE

おじいちゃんは、1000のいいねがあれば、ミニ馬を手に入れるだろうと言ったので、後ろのポケットに収まるほど小さいです。

BACK INTO ENGLISH

Grandpa said that if he had 1000 likes, he would get a mini horse, so it's small enough to fit in his back pocket.