To insist on only drinking water out of the kids tumbler in the bath?
For context : DCat is 7 years old, neutered male. He has a split food dish but we stopped putting water in one half as he would crunch his kibble over the water, which would then get manky, so both sides of the bowl are for food, it has been this way for years. We also have a dog, who has a bowl of water down 24/7,cleaned regularly. DCat has always shared the bowl (will only drink it via his paw though, dipping the paw into the bowl then licking the water from his paw, very messy but whatever), again this has been the case for years.
Now, all of a sudden he will ONLY drink from the blue plastic tumbler that lives in the bathroom to assist with washing the kids' hair. To the point that he miaws outside the bathroom door if it's shut, and will race us upstairs and straight into the bath to alert us if his cup needs filling. This water, he will lap up directly, no needing to use his paw. He would apparently die of thirst if the tumbler was not available to him.
Is he BU? Why will he not drink from the dog bowl anymore? DCat and DDog don't appear to have had an argument, they both ignore each other to the same extent they always have. The water hasn't changed that I'm aware of. Does bathroom water taste better than kitchen water? Is it possible there is a faint residue of shampoo that is tempting him to the tumbler?
Is my cat an arsehole BU?