one of my males didnt drop one of his until 10 weeks. It could be felt close to where it should have been. Once I stopped fiddling and checking it did appear so it could have been me that held it up :-(
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'Fiddling' can be counter-productive indeed. Many's a time a puppy has been taken in the ring, around 6 months, only for them to have 'disappeared' Lol. Resulting panic on the part of owner and judge (this was before castrated males could be shown - they can now, but it would be unlikely an entire dog of similar quality wouldn't be put up ahead of the castrated exhibit). And a deal of embarrassment, has to be said. Some puppies can pull them up.
Personally I'd prefer them to be 'around' by 7 months, but would wait until over a year to give 'em time, and to allow some maturity before having to go in to find the missing one.
Maybe a talk to the original breeder could throw some light on what's going on (whether a delay is known within the breed/bloodlines). In any case, if this dog turns out to be monorchid, the breeder needs to know as this pairing should really be avoided.