Cat is girl so she is a not cat
Animals (and even little babies) are mostly addressed as "it". It is cat, It is a baby.
It is not a cat
it is not cat hindi mi
Cat is a living thing so use this and that
Technically यह एक बिल्ली नहीं है could mean:
It is not a cat, He is not a cat, or She is not a cat.
In English we don't have genders, so the cat could be male or female. If you aren't sure then you can also say 'It'.
A nhi diya hi
it is not a cat
why "it" is translated "यह"? Shouldn't it be "वह"?