Doll: she said that only in the case you're talking about the mouse you need for your computer you can say also mouses as a plural, but when you are referring to the animals you have to say mice
There are two accepted plural forms of the word 'mouse' when you are referring to a computer mouse: mice and mouses I bought two new mouses for my PC. = I bought two new mice for my PC.
If you are referring to a small animal called a 'mouse', then the only correct plural form is 'mice'. My cat likes to chase mice.