My dog got her foot caught in some plastic netting whilst out on a walk this morning. She freed herself, no fuss, no yelping, carried on as normal. I noticed a bit later that there was some blood on the floor in the hall and she has lost a claw on her back foot - presumably pulled it off on the netting. Its not bleeding now and she's not even limping (she's a tough dog) - but does this need attention? Will it grow back?