Mirrorless for cats?

I thought mirrorless because of less camera bulk to carry. Typically with cats, the right hand is holding the camera and the left hand, a jingly toy or snack to get the cat's attention. So, after reading about all the new mirrorless compacts, thought great new cameras with perhaps fast autofocus, no need for flash, less heavy.

Thank you for the 2cents, I took note of the lens and will see how the dslr cameras feel in my hands. Thank you!