Stabba has a point, if there was a pre-set template for selling a dog, it would make things a lot easier.
Something like.
Sex, F
Age, 5
Height, 23"
Experience etc.
However, the truthfulness or lack of it of the seller could possibly render that obsolete, or it could make those that are a little economical with the truth a little more wary of telling little porkies, if it is down in black and white.
Just a thought.
TC