1) Has Assel got a dog?
no, she hasn't
2) Have Boris and Kuat got a dog?
no, they haven't
3) has Assel got a rat ?
Yes, she has
4) Have Boris and Kuat have a rat ?
no, they haven't
5) has Assel got a bird?
Yes, she has
6) Have Boris and kuat got a bird ?
Yes, they have