
HI Again :-))
>KC may well regard the explanation incomplete if it is not mentioned.<
You only have to explain what the endorsements are for and that they are there in place. I am 100% sure of this. You are under no obligation whatsoever to explain why or when you would lift them in the contract for the KC.
Now whilst I can understand where you are coming from with the "IF" for a buyer. Perhaps you ( not you personally) are happy to let them breed from the puppy if healthy checks etc are met but when you put things in writing you have to be 100% sure your wording doesn't imply or that it could be interpretated another way. What reads clear to you can be torn in two by someone clever with changing the interpretation of the wording ;-), or they may imply you have explained it differently to them. " look she has IF in her contract so she knew I wanted to breed" It has all be tried and tested by many a con artist.
I have personally helped 5-6 people this year with problem contracts after people have tried to get round them. Most all have made them too heavy, too lengthly ,too complicated and far too many IFs :-)
Again and just to reiterate for the questions ,whist you (again not you personally)or anyone may sell a puppy and then let the owner have a litter later on that is entirely up to you or the breeder, the Kennel Club is not interested in that part, they just need to know that you fully explained the Endorsements and that the buyer understood them.
>our relationship is based on trust and friendship right from the beginning otherwise they would not have got one of my pups in the first place.<
If only this could be true, if this was the case you, I or anyone would not bother at all with the endorsements. All the best vetting in the world won't catch a clever trickster. What starts out as a lovely relationship can break down quickly. We read it week in week out on here people trying to get around the breeder. I had one myself , someone I would never in all my life think would try to get around me. Attempts were short lived though. :-)
The best contract is one that is clear and simple.
To be honest I personally think the puppy contract works best as "a pet puppy contract only" and never for breeding. Then there can be no mistake. If you decide to lift the endorsements later fine but if the intention is not in writing there is no way you can be "held against a wall" to lift them.