When you breed a Blenheim to a Blenheim you always receive Blenheim puppies. The genetic make-up of a Blenheim is ee:ss. Blenheim is the easiest color genectic make-up for Cavalier King Charles Spaniels.
When you breed Blenheim to Tri Color you can receive both Blenheim or Tri Color.
When a Blenheim is being bred to a Ruby which does not carry the white gene all the puppies will be ruby and some white mismarking is possible. When a Blenheim is being bred to a Ruby with the white gene then both Ruby and Blenheim colored puppies are possible and some white mismarking on the Ruby colored puppies is possible. Whan a Blenheim is being bred to a Black & Tan that does not carry the white gene then both whole colors are possible and some white mismarking is possible. If the Blenheim is being bred to a Black & Tan that does carry the white gene then all four colors are possible and some white mismarking is possible on the whole colors.
When you breed a Blenheim to a whole color (black/tan or ruby) the offspring will automatically carry the white gene giving the whole color offspring the ability to produce all 4 colors if bred to a Blenheim or tri color or if bred to another whole color that carries the white gene as well.
Sometimes when you breed a Blenheim to a rich dark ruby you can greatly improve the rich dark red coloring in the Blenheim offspring.
