Dob and Mob

There was a man,
And his name was Dob,
And he had a wife,
And her name was Mob.
And he had a dog,
And he called it Bob,
And she had a cat,
Called Chitterabob.
Bob, says Dob;
Chitterabob, says Mob.
Bob was Dob’s dog,
Chitterabob Mob’s cat.