Put something gnarly in there.
Shut the toilet door.
Hahaha good grief. Put a latch higher up on the door?
Put something nasty in the cistern. Or if you can't access it, in the bowl each time you flush.
I'd say hot chilli sauce, but our dog loved Habanero tortilla chips in eye watering quantities. But the merest hint of mint, specificaly in tooth paste, on the other hand......so maybe concentrated mint food flavouring.
He knows there's fresh water there,when did he start doing this?
He doesn't like it,clever dog.
Some of it's crap.
Close the bathroom door
make sure he has enough water....maybe pick up a free ceramic toilet and make it into a drinking bowl for him...like in the kitchen...lol...
I would just take video of it. And upload it. And keep paper towels to wipe off the seat cuz who wants to sit down on a splashed on toilet seat?
Give him something else to drink
There is nothing worse than "Toilet Breath". lol
Shut the lid.
Bungie cord around the lid
take a huge **** in there.
Big bowl of fresh water every day
Close the door when you're done?