My beloved backyard rabbit Marshmello died on Friday. Not sure at all what happened. I watered weed killer onto my lawn after the Home Depot guy said it should be OK. I told him my rabbit lived in the backyard (with garage for shelter and a heat lamp for warmth as needed. Not sure if this was an issue or not. Marshmello does eat grass and other plants in my yard that got sprayed. Around that time, I noticed him hunkered down with his eyes closed, sitting very quietly. I thought he was looking very content since the weather was very nice. After a week and a half, he lost his appetite and it was then that I became concerned. With him totally not eating for the last few days, I was afraid for his life. The next morning, he was hardly moving and was a bit limp. I stroked him under his ears at the base of his neck. It was very warm and I felt what seemed like something or fluid rushing from the spine past his neck into his head/brain....so that's why I was wondering if he was experiencing that same sensation when I saw him hunkered down, still, with his eyes closed in the past week. I know rabbits get viruses out of the blue and die for unknown reasons. But my big question is if anyone else has experienced the warm neck and fluid-rushing sensation in their rabbit at all.