Corrections in red.  Stylistics in blue.

My cat.

Sabrinah is the name of my cat.  She is almost three years old.  She loves to run around in my home.)

It is very unusual in English to use decimals in the context of years.  One exception:  when we are dealing with half ( .5 ) a year.  Thus, you could write 2.5 years, but not 2.9.