My cat weighs about 6kg and and takes the trough just great! I've fixed it quite simply on the heater by hanging and the cat times draufgesetzt to see how he reacts to it. And he has rolled immediately and purred! Before that I had specially still turned on him the heater, so he has it pretty comfortable. Well, what can I say, he is already the whole evening in it. Will probably be new Favorite place to sleep! ;)