How to Say "only my puppy" in Korean? - 강아지만

"only my puppy" in Korean is 강아지만 (gangajiman)

친구는 케이크 먹어요. (chinguneun keikeu meogeoyo) - My friend eats cake.
친구만 (chinguman) - only my friend
친구만 케이크 먹어요. (chinguman keikeu meogeoyo) - Only my friend eats cake.
친구만 케이크 먹어요. 저는 커피 마셔요. (chinguman keikeu meogeoyo jeoneun keopi masyeoyo) - Only my friend eats cake. I drink coffee.
친구는 바다 가요. (chinguneun bada gayo) - My friend goes to the sea.
친구만 바다 가요. (chinguman bada gayo) - Only my friend goes to the sea.
친구만 바다 갔어요. (chinguman bada gasseoyo) - Only my friend went to the sea.
친구만 바다 갔어요. 저는 바다 안 갔어요. (chinguman bada gasseoyo jeoneun bada an gasseoyo) - Only my friend went to the sea. I didn't go to the sea.