I have seen oversized toys and minis being shown, so don't give up for a half an inch or an inch. I also have only once seen a wicket being pulled out at a show and it wasn't for a poodle!
Measuring with a tape measure or even using the comb is difficult and probably not the most reliable. Also, you have to be sure that you are measuring in the correct spot, one inch forward or back will give a different result. I can measure Finnegan anywhere from 26-28 inches.
If you can find a wicket, that would be the most reliable measure, but you still have to be careful of the placement. Assuming that her front legs are solidly under her and not forward, you need to draw a straight line from the back of her leg, up past the elbow to the top of her back. That is her withers and where she should be measured.
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