YOU SAID:

i was once a toddler but now i have a dog

INTO JAPANESE

私はかつては幼児でしたが、今は犬を飼っています

BACK INTO ENGLISH

I used to be a toddler, but now I have a dog

INTO JAPANESE

以前は幼児でしたが、今は犬を飼っています

BACK INTO ENGLISH

I used to be a toddler, but now I have a dog