The best we can determine it was a new plant that recently started growing in one spot of the yard. The stems have needle-like hairs that stick out. Daddy discovered the new plant when he stepped on one. The sting lasted four hours, then his foot and leg were numb for 18 hours.
Malibu was in considerable pain for probably a few hours, fitfully trying to fall asleep. She got a tiny aspirin and then feel asleep. Since then, she's been sleeping and sleeping in Mommy's arms. After sleeping 4-5 hours, Mommy got Malibu outside for a pee break and some food and water. Malibu wasn't interested in any of that. So, Mommy put her back to bed. Freddy hasn't been interested in any of that either. He stays on the bed with Malibu, making sure she's okay.
Luna's been worried about her baby sister too. She stays close to Malibu and checks on her from time to time. Daddy's mad that plant keeps growing in the side yard. He went out there this evening spraying weed killer and hacking around any place that plant might be growing. Nobody wants this to happen again, especially Malibu!
Update: Malibu had a tough night, but she feels better this morning. She ate and drank a little for breakfast. Now, she's running around playing. She's not her usual chaotic self, but she's playing well. She even barked at the neighbor's white, fuffy, yappy little dog. That's Freddy's job, so she must be feeling better.