YOU SAID:

the best dogs are ones that wag their tail a lot

INTO JAPANESE

最高の犬は尻尾をたくさん振る犬です

BACK INTO ENGLISH

The best dog is one that has a lot of tails

INTO JAPANESE

最高の犬は尻尾がたくさんある犬です

BACK INTO ENGLISH

The best dogs are those with many tails

INTO JAPANESE

最高の犬は多くの尾を持つものです

BACK INTO ENGLISH

The best dogs have many tails

INTO JAPANESE

最高の犬は多くのしっぽを持っています

BACK INTO ENGLISH

The best dogs have many tails