Penny was eating heaps of grass on Sunday (and she had been grazing since Friday) so we discontinued her pain medication - Previcox - having read that it can cause nausea. Interesting discussion on this drug here. I generally would trust a specialist vet over unmoderated discussion on the internet, but I'm glad we stopped this pain relief and I won't allow her to have it again, if possible.
And this morning - Tuesday - when we first got up from bed, we were greeted with this in the house!
We don't know which end it came out of, but tend to think it was the rear end, because we weren't woken by the retching and other horrible noises that usually accompany a vomit. On the other hand, she has in the past produced things like this from either end.
At all events, she is lively and happy today, though she still has a bit of a cough when she plays energetically with her toys.