Half the problem with short haired pets is that the hairs are quite short & rigid and tend to get pushed into the pile , vacuums will get the loose surface ones off but can also push the rest further into the pile and the more you run the hoover head over them the more they get pushed into the pile.
You need to pull the hairs outwards from the direction they went in ,tape works very well for this process as it hold onto the hair instead of just pushing them around making them more embedded.
the stickier the tape the better, don't rub the tape over the hairs more than needbe if you can help, dabbing works best , same applies to seats and headlining.