Holden is one of Soxy's children, though we are not sure of his position in the birth order. Seems like either he or Cowie (so-temporarily-named because of her resemblance to a Holstein) was the oldest, but who can say...
Since he's grown up with so many dogs, he's quite comfortable with them. Chance will, at times, pounce on him and nibble at his neck, but Holden just freezes and waits until he can get away. They never hurt one another.
Holden also likes to play with feet, so he can't be in bed when we are.
He and Soxy are the best cats ever. So there.