>> but to the form signed by the stud dog owner
> Not if it's done online.
You cannot register a litter online if the sire is foreign. It HAS to be done on paper, and you need the form.
If the dog has their ATC number then you don't need the pedigree and the extra fee, if it does then obviously you do, as that would register it with the Kennel Club.
As the dog I used had his ATC number I actually queried the rule about having to send in the form rather than online since he is registered here, but the online system doesn't have access to ATC numbers. Their explanation was that anyone can copy an ATC number from a catalogue, so the paper registration ensures they can check the signature against what they have on file.
I understand it, but still think it was a bit silly and time consuming. It also ended up with them sending out 3 copies of one of my pups' registrations as for some reason they just couldn't get the name right no matter how neat my printing was in those teeny little boxes ;)
And even if you register a UK breeding online you are still required to keep a signed copy of the form as proof of the breeding/agreement.