He looks like a sooty recessive yellow to me
A good point Beth, thank you for adding this!bethmccallister said:The sooty is probably coming from being Agouti based. I do know that recessive yellow is a/a - e/e which is a black base and not agouti and I'm sure the blue is messing him up too. To get more yellow...if you have a black doe breed him to her...select the best typed doe from that litter (they'll all be carriers of yellow) and then breed him to his daughter...you should see a couple yellow in the resulting litter and hopefully ones that aren't carriers of other colors. The yellows will still be a bit sooty like Roland states, you'll want to introduce chocolate to remove it completely.