YOU SAID:

I have a lot of hamsters that like to pee on themself

INTO JAPANESE

自分でおしっこするのが好きなハムスターがたくさんいます

BACK INTO ENGLISH

There are many hamsters who like to pee on their own

INTO JAPANESE

自分でおしっこをするのが好きなハムスターはたくさんいます

BACK INTO ENGLISH

There are many hamsters who like to pee on their own