Sadly found a field mouse this morning who by the looks of him (barely moving but for occasional jerks) has been poisoned. I also found a small speck of blue on his upper teeth which I think confirms it. I've set him up comfortably in a box with some wool, and have given him some water mixed with A-K vitamin (I read that vitamin K can help antidote the poison) via a pipet, but he isn't eating or drinking on his own and doesn't seem to be improving or getting worse.
It's just so heartbreaking seeing him suffer but I wanted to check if there was absolutely anything I could possibly do to save him before taking steps to end his suffering.
Any advice greatly appreciated.