YOU SAID:
my dog is tripping on nothing
INTO JAPANESE
私の犬は何もつまずいていない
BACK INTO ENGLISH
My dog hasn't stumbled on anything
INTO JAPANESE
私の犬は何にもつまずきませんでした
BACK INTO ENGLISH
My dog didn't stumble on anything
INTO JAPANESE
私の犬は何にもつまずきませんでした
BACK INTO ENGLISH
My dog didn't stumble on anything
That didn't even make that much sense in English.