YOU SAID:

my dogs head fell off

INTO JAPANESE

私の犬頭からを落ちた

BACK INTO ENGLISH

I fell down from my dog's head

INTO JAPANESE

私は私の犬の頭から落ちた

BACK INTO ENGLISH

I fell off my dog's head.

INTO JAPANESE

私は私の犬の頭から落ちた。

BACK INTO ENGLISH

I fell down from the head of my dog.

INTO JAPANESE

私は犬の頭から落ちた。

BACK INTO ENGLISH

I fell off the head of a dog.

INTO JAPANESE

私は、犬の頭から落ちた。

BACK INTO ENGLISH

I fell off the dog's head.

INTO JAPANESE

私は、犬の頭から落ちた。

BACK INTO ENGLISH

I fell off the dog's head.