Labrador

The man had just settled into his seat next to the window on the
plane when another man sits down in the aisle seat and puts his black
Labrador in the middle seat next to the man...

The first man looks very quizzically at the dog and asks why the dog
is allowed on the plane.

The second man explains that he is a Drug Enforcement Agency officer
and the dog is a 'Sniffer dog'. 'His name is Smithy and he's the best
there is. I'll show you once we get airborne, when I put him to work.'

The plane takes off, and once it has levelled out, the agent says:
Watch this.' He tells Smithy to 'search'.

Smithy jumps down, walks along the aisle, and finally sits very
purposefully next to a woman for several seconds. Smithy then returns
to his seat and puts one paw on the agent's arm.

The agent says, 'Good boy', and he turns to the man and says: 'That
woman is in possession of marijuana, so I'm making a note of her seat
number and the authorities will apprehend her when we land.'

'Say, that's pretty neat,' replies the first man.

Once again, the agent sends Smithy to search the aisles. The Lab
sniffs about, sits down beside a man for a few seconds, returns to his
seat and this time, he places TWO paws on the agent's arm. The agent
says, 'That man is carrying cocaine, so again, I'm making note
of his seat number for the police.'

'I like it!' says his seat mate.

The agent then tells Smithy to 'search' again.

Smithy walks up and down the aisles for a little while, sits down for
a moment and then comes racing back to the agent, jumps into the
middle seat and proceeds to shit all over the place.

The first man is really amazed now by this behaviour and can't figure
out how or why a well-trained dog would behave like this, so he asks
the agent 'What's going on?'

The agent nervously replies, 'He just found a bomb.'