*woof woof woof woof woof!!!!*
he could possibly mean:
"play with me! play with me!"
or
"shut up! shut up!"
or
"vaccuum me! vaccuum me too!" (which we sometimes do, just to tease him)
on the other hand, he never bothers the mop and steers clear of it all all times.
no barking, no wagging, no madness.
he enjoys talking to the vaccuum cleaner.