I also have a blue roan and tan dog and have been very confused as to wether he is a tricolour, in Judy de Casembroots book , The Merry Cocker, which I quote, she gives the difference between the colours and states, blue roan and tan, black white and tan and tan-liver, or chocolate,roan and tan as being classed as tri-colours. Have also phoned the kennel club and they confirmed a blue roan and tan is a tri-colour, as they have three colours on them.
Rupert's Mum