Working away at his computer, Brian heard a huge scrabbling ruckus happening behind him. When he turned to see what was going on, he found this. Oscar is super serious about killing that fishie toy and he disapproves of interruptions.
Udo is so used to this type of ruckus he didn’t bother waking up to investigate. That could just be self preservation, though. Oscar uses him as a trampoline all the time and would not hesitate to tap him on the snout.