Last evening I enlarged the hole. This morning Mimi complained a lot but ended up using the bowl. Ziggy went to the dinning room floor... I will stick to this method for some more days, but I am tempted to use the bowl with litter/cardboard with a hole way (check the DIY Systems page).
We went to the vet for vacination and nail trimming. No problem with Ziggy but there were three persons around Mimi to manage a manicure. She really likes her nails...
Just noticed the radio anthena was chewed off. Payback for a stressfull morning.