Penny ran into a patch of foxtails a few weeks back. They're nasty. We noticed Penny chewing on her foot for a few days. She'd walk a few yards and then plop down to chew some more. We cut the hair on her foot to investigate and found little of interest. Nonetheless, when we pulled out what we thought was a hair, it turned out to be a foxtail buried under her skin. About an inch long, we thought we avoided further damage.
We thought wrong. A few days later a new wound showed up a few inches up on her leg. So we took her to the vet. They knocked her out and managed to pull out another foxtail, about three inches long, from under her skin. When we arrived in the lobby to pick her up, the nurse who was watching her sleep off the anesthesia came out to talk. She said Penny woke up and seemed really happy to see her (the nurse). It was a few moments later that she realized Penny could just hear us talking in the lobby and was anxious to show off her shaved leg and wound.
She had to wear bandages, concealed beneath my sock and some duct tape, for a few days. She hated it.