YOU SAID:

my cat just sat on a dogs ear

INTO JAPANESE

私の猫は犬の耳に座った

BACK INTO ENGLISH

My cat sat in the ear of a dog

INTO JAPANESE

私の猫は犬の耳に座っていた

BACK INTO ENGLISH

My cat was sitting in a dog's ear

INTO JAPANESE

私の猫は犬の耳に座っていました

BACK INTO ENGLISH

My cat was sitting in the dog's ear

INTO JAPANESE

私の猫は犬の耳に座っていました

BACK INTO ENGLISH

My cat was sitting in the dog's ear