My dog now drinks out of the toilet. I think this is one of those natural progressions as a puppy is growing up. It's like when a child takes the first step, or starts to speak. Imagine this conversation:
My little Lisa is starting school tomorrow.
Oh, is she? Don't they just grow up so quickly. My Gweilo is now big enough to drink from the toilet!
Ah, and I can still remember when you brought him home. He was so little.
It's disgusting but at least I'm now winning the "lid up or down" argument in the flat!