Permanent Spay or Neuter

I often retire dogs that don't meet certain critera.

However, I also know that some members would prefer that they be sold instead.

I would consider that if there were some way to make a spay/neuter permanent and unaffected by a magical dog biscuit.

Sometimes, dogs are accidentally inbred, or too closely linebred. Or players are trying to keep a line of theirs clean and rare, so that when they are looking for mates in the future, they don't come up with dozens of related dogs making higher TP breeding difficult.

So, instead of retiring, if I could make a spay/neuter permanent, I could sell the pups to other players.