I would argue 25, maybe 30, or more, for other breeds... I mean, pockets are limiting ANYWAY, as is ability to use them, so why make it so low?
Besides, 10 means they could never carry a medkit, so a medic dog similar to rescue dogs in the mountains wouldn't be a thing.. ..and I really want that to be a thing
Got admit having a spotter / medic dog to immediately run over a medkit ASAP to people in trouble is a nice idea, and would partly resolve "useless" dogs quite a bit.
Plus, keep in mind, 18 is pretty much anorexic weak, and dogs can carry more sometimes than a frail female, so, I think dogs should be given a LITTLE credit
Big thing is giving them the room to do so, the harnesses, ect... ...I suppose there might be questions on how they put stuff in / out, but thats already there now anyway... .. It can be assumed they have it in their mouth, but... This does not explain everything, such as multiple large items. Besides that, I could see the "hind leg scratch" technique applied to fastening items with velcro or whatever, with damn good training.
.... a better idea is to limit the actual pockets availible to the dogs, based on armor...
slots is ability to actually hold / fasten to body....strength is how much your muscles / spine can tolerate.