I have seen Dvorak many times and from what I remember he should be sterilized since years and he is younger than Galiba.
Should, but he did officially an Sarloos litter in 2007, means that till this time he wasn't sterelized, it fits perfectly with the birth data of the S (2005), V (2006) and Y (2007) litter born as CzW in Crying Wolf kennel.