yeh most people are known in communities as 'doggers' so maybe just ask around before hand.
Um seems im in a differnt country to you, so I wouldnt know what the go is where you are as to where to place ads sorry, but try the internet, just on a free advertising horse site in your local area, that's what we do.
If your giving him away or selling him like really cheap, its not really worth advertising him where you have to pay for it. So maybe some posters in saddlery stores aswell, local fodder shops, and also keep an eye out for people who are advertising for a give away companion horse, as that is sometimes the way to go. (it does happen, also a family pet)
So yeh just localy I wouldnt worry bout trying to advertise big, coz then you probably would start getting the doggers in.
When you mix training and dedication your called... a professional
When you mix compassion and caring your called... a friend
When you mix bravery and selflessness your called... a hero
When you mix all three your called... A FIREFIGHTER!