YOU SAID:

I do not believe that dogs can drive cars because their thumbs do not exist

INTO JAPANESE

親指がないので犬が車を運転できるとは思わない

BACK INTO ENGLISH

I don't think dogs can drive a car because they don't have a thumb

INTO JAPANESE

親指がないので犬は車を運転できないと思います

BACK INTO ENGLISH

I don't think dogs can drive a car because they don't have a thumb