Nigel is also an 'attention barker' ....about 20 minutes before supper time.
The only thing that 'works' is to totally ignore him.
We have to not even look at him or acknowledge he is in the room....then he'll stop barking after a few seconds and walk away.
If you give him the slightest glance or -- heaven forbid -- speak to him, he just gets louder.
DH has the worst time with him because he usually tells Nigel to 'be quiet'.
I have more will power, and Nigel rarely barks if I am home.