Someone threw a bucket of water over the dogs to separate them.

Ah!
I deduce, therefore, that you must have been delivered a long time after your twin because the dogs had time to dry off before you were born! (Otherwise, the water was thrown between the births, and
you should be 'two wet dogs'.)
I remember a frantic scene in the street as a child ... A cry went up "
Quick, get a bucket of water!" Two poor dogs had been enjoying a game of leapfrog when a sadistic adult decided to spoil it by giving them a good soaking.
(It is always a complete waste of time. Every male dog
'does a Mastermind' - "
I've started, so I'll finish"

)