
What a helpful boyfriend!
Seriously, the only time I have seen this from one of my dogs was when (as we discovered a couple of days later) she'd stolen a sandwich wrapped in clingfilm, and the plastic wasn't coming through properly. We had to give her lots of rehydration fluid as she was getting very dehydrated (a pint of water, a tablespoon of sugar and a
teaspoon of salt dissolved in it). The vet said the test for dehydration was to get hold of her scruff then let go. If it went back instantly, she was okay, but if it went back slowly she was getting dehydrated.
After 2 or 3 days of this (well in herself, but always trying to poo and only producing a couple of drops of bloody mucus) she managed to pass the clingfilm, and was immediately fine again.
Hope your girl will be well too.
:)