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There is a 1 point evolution for eidolons available called "Mount", which lets eidolons be used as combat mounts. I think that makes perfect sense, but if one is going to open up the possibility of using eidolons like normal "animals" (at least in some respects) then I think that there is another 1 point evolution that should be available:
Draft Animal: The eidolon is properly formed and skilled to be used as a draft animal for pulling plows, carts, wagons, etc.. While this evolution does not provide the harnesses and other gear that are needed to actually hitch the eidolon up to something, it is formed so that it can make use of the standard equipment that would normally be used for a draft animal of its size.