I have decided to become more affirmative toward cat (and dog!) hairs. I have decided they are to be like my signature on the image (so far, the animals don't begrudge me this). It has gone so far that, if I don't see one on the negative, I toss the thing and start over. And I yell at the pets for falling down on the job.
This reminds me when I shot my first medium format film about twenty years ago. I bought a used Mamiya RB67 with 90 mm lens. When I got my film back, each shot had this reddish thin line across them. I thought I bought a broken camera or lens. Then it hit me. My wife's a red head! Nah! Can't be.
So I remove the rotating film back and slide off the dark slide. And sure enough, there's one of her red hairs stretched stuck across the film exposure area where the dark slide plate sits. Well it did add to the composition of each shot.