Dog At Western Union

A German shepherd went to a Western Union office, took out a blank form and wrote:

- Woof..woof..woof..woof..woof..woof..woof..woof...woof.

The clerk examined the paper and told the dog:

- There are only nine words here. You could send another 'woof' for the same price.

The dog replied:

- What, and ruin the punchline?!