As above, take them by the scruff, just thumb and pointing finger, they will "yawn" this is a sign of submission.
They wil be very limp, but taketoo long they will get very fidgety and try to scratch,
the correct way to cut ferts nails is along, and not down.
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cutting down ways will create a point and will not be nice to walk on, cutting along, " horizontal" will keep the natural flat patterm -
I have a habit of cutting 4mm below the vein that you can see in the nail.
All the best.