When each of us go apply the Byron Katie inquiry process to a belief, what we discover is what happens with a human being when she/he believes in a thought.
It is not personal, it just happens to be expressed in our lives right now.
If cats were thinking, the same process would probably take place in them as well.
I should be a better mouser.
Is it true? It appears to be true.
Can you absolutely know it is true? No.
How do you react when you think that thought? I feel ashamed. I think of all the mice that have escaped. I think of how much time I spend just lying around. I think of the cat next door which seems to catch a lot more mice than me.
etc.