8X4 is plenty big enough for 2 does. I have kept 2 does together in a 4X4 with plenty of room to spare! A ramp or a step would be good since they do like to climb/jump anyway. I've got a 4X7 off the ground house and I just use a chair for them. They jump in no problem for a bit of grain at first, then it's just habit. Since you're using it for shelter and sleep anyway. Also, depending on how far off the ground it is, you could board off the bottom of it and leave the side towards the fenced area open in kind of a lean-to way. Could also potentially be a separate living quarters for a buck or when you have kids due.
ETA my does are about 20 and 22 inches at the shoulder
ETA my does are about 20 and 22 inches at the shoulder
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