I clip my cats' nails, usually without any issues. I can usually see where the blood vessel is, and so not cut too close. Once my cat moved, and I cut too much; he bled quite a bit. I ran to the store and bought this. It stopped the bleeding almost immediately. I use a q-tip, dampen it, dip it in the powder, and apply it to the bleeding nail. I keep this close by whenever I cut my cats' nails, and only need it sometimes, but those nails can bleed A LOT, and this powder is painless and effective.