Can you put breeding restrictions on a dog after they've been KC registered? 

You can put endorsements on any dog while it is still in your ownership and physical possession.  You don't have to be the breeder.

Am I able to do it online?  Will be phoning KC anyway tomorrow.

To add or remove restrictions you have to write to them stating the dogs details and what it is you want put on.

You can put endorsements on any dog while it is still in your ownership and physical possession.  You don't have to be the breeder.

Ditto only thing I would add is the breeder is the only one who can remove them even if it was the 2nd owner who put them on.

Really?

I always thought that only the person who placed the endorsement could remove it.

So, if I bought a puppy and then sold it on, I could place an endorsement for what I thought was a good reason, then the new owner could aproach the breeder and ask for it to be removed?

Dawn R.

>I always thought that only the person who placed the endorsement could remove it.

It is. The KC website says:
"An endorsement may only be lifted at the written request of the person who placed the endorsement."

Thanks guys, better getting writing today then!

You would need to check with the KC as it's website is a big vague on this point. JG is write with her quote it does suggest that the person putting them on even if not the breeder could remove them again BUT that was the rule when I encountered this situation. Unless someone knows it has changed. 

I bought a bitch that had endorsements on which were later removed by the breeder for me to have a litter.  I had a litter from her and put the endorsements back on after keeping a lovely bitch from her. I was going to let the mother go to a family freind of mine. The daughter I had kept had to be spayed so I decided to have another litter from the mother and I had to go back to the breeder to get her to send another letter to lift the endorsement again.   That was approx 4 years ago.