Sounds like it could be. The same thing happened to Brodie and she didn't realise at all what had happened (rather glad of that, she's a very clean dog and would have been horrified). She even left a little wet patch on my jeans as she sat on my knee, when we were on the way to the vets on the bus. It took one little injection from the vet to sort it out
Steroids can also cause it, just in case Sash is on any treatment.