The lady had taken her extraordinarily large Labrador dog on his periodic
outing to the park. As someone who, by her own admission, knew everything
worth knowing about dogs, she religiously took the dog on regular trips and
varied neither route nor schedule. Because the animal was occasionally
determined to have his own way, she
wasn't concerned when he became very obstinate and refused to get into the
car to go home.

She had to drag him into the car and out again when they
arrived. Thereafter, the dog refused all commands and became unpleasant
when her husband returned home.

Bewildered, she left the dog to himself and pondered where her dog-knowledge
might have come apart.

Sometime later the phone rang and a strange voice began,
"I don't know you but I'm calling from the park. Do you realize that your
dog is waiting for you here? I got your number from the tag on his collar."