A man riddled his friend: A mother dog was crossing a river with her five kids, She carried two

under her arms and tree on her back, When they were standing on the other side of the river, the

responsible mother checked the number of her lovely babies and droped her jaw...... there are

only four kids with one lost!!! Please tell me why?

His friend thought a long time and could not find a satisfied answer.

In the end the man said:"It was a fool doggy".