This was forwarded to me from the Border Collie banter elist - if you are the author please contact me to be credited for writing your article!
Dog runs around the house and hides under furniture while making a prolonged 'uuuurka-guuurka, uuurka-guuurka' noise. (this noise is the only thing guaranteed to wake up a true dog lover who is hungover from a post dog show celebration at 3:30 am) After mad scrambling to capture the dog and drag him outside the episode ends with an indelible ten yard line of slimy yellow froth from the living rug to back door.
Dog exercises hard and a) eats large mouthfuls of snow(Winter Blap Disease) or b) drinks a bucket of water (Summer Blap Disease). Within 2 minutes of returning inside the dog spews out large amounts of clear slimy liquid while making a distinctive 'blap' sound and sharp percussive noise as it hits the linoleum.
Dog suddenly clears his throat with loud and dramatic 'gggaark, gggark,' noises, generally followed by prolonged 'iiikssss', licking sounds and then loud satisfied smacking noises. There is nothing on the rug. Don't investigate, you don't want to know.
Appropos of nothing, the dog strolls into the dining room and waits till the innocent dinner guests are all watching him. Then with a single deep gut-wrenching 'raaaalfff' disgorges the entire week's contents of his stomach on the dining room rug. VARIATION: then he eats it.
In all the above events, the dog is entirely healthy and indeed deeply pleased with himself.