I just visited my pup for the first time and he is gorgeous, a little chunky monkey i could kiss all day long. He's a tri-colour, his mother is a blenheim and father a tri but the white on his face is a good bit discoloured like a faded brown rusty colour. Is this just a puppy thing or will he always have that.. Its not a mark or anything just a funny off colour. He's almost four weeks...