YOU SAID:

my dog has pooped badly in the back yard

INTO JAPANESE

私の犬は裏庭でひどくうんちしています

BACK INTO ENGLISH

My dog is seriously depressed in the backyard

INTO JAPANESE

私の犬は裏庭でひどく落ち込んでいます

BACK INTO ENGLISH

My dog is very depressed in the backyard

INTO JAPANESE

私の犬は裏庭でとても落ち込んでいます

BACK INTO ENGLISH

My dog is very depressed in the backyard