Dog Sends Telegram

A dog goes into a post office to send a telegram. The clerk gives him the relevant form and he goes to the desk to fill it in.

When he has finished he hands it back to the clerk with the fee and the clerk reads it through.

The message reads " Woof woof, woof woof woof;  woof woof, woof woof woof."

The clerk then tells the dog that, at no extra cost, he could have another 'woof' in the message.

The dog replies, "Yes, I know, but then it wouldn't make any sense!"