YOU SAID:

My horrible mother shat on my dog, causing him to vomit back on to her

INTO JAPANESE

私の恐ろしい母は私の犬をたわごと、彼を彼女に嘔吐させました

BACK INTO ENGLISH

My terrifying mother shit my dog and made her vomit

INTO JAPANESE

私の恐ろしい母は私の犬をたわごと、彼女を嘔吐させました

BACK INTO ENGLISH

My terrifying mother shit my dog and made her vomit