I continued with the small amounts of AD through the night, and although Butter still has diarrhoea, it doesn't shoot out right after a meal, and the diarrhoea isn't that watery anymore.
I suppose (and hope) that this is a small improvement.
He is still active. He walks around the room and the kitchen, and can even respond to Peanut's invitations to play, but gets tired easily.
I hope the antibiotics will continue doing its job, and Butter will recover soon.
He does look a little better today.