Is there one actually confirmed there? I know you said the same thing when I asked on a topic last week about the same thing. I don't wish to get all the way there and to find that there is no unentered dog tent :-).
They do normally have one run by the RSPCA but not sure if they still do. It is usually shown on the site plan sent with passes but ive not printed mine yet so dont know if its there this time.
According to the plan of the show ground which I have just printed off, yes there is one to the left of car park A, which is left of entrance gate A :)