Anyone have pets?

So

How do I get my 14 month old to stop pulling my cats tail? I feel so bad for my cat. My son wants to play with her, and he does gently pet her, but then when he tries to play he pulls her tail and makes her meow. I tell him no, and I always say “ow, that’ll make kitty cry” but idk what else to do. I also say gentle and show him how to pet her