Non-permanent picket fencing to divide backyard
My husband and I are wanting to divide our backyard with a picket fence in a non-permanent way so that our son can have a pet-free area to play in but we can easily just open the back door for the dogs to do their business in the sideyard. The most logical area to accomplish this would involve setting the actual fence panels along the length of the concrete patio with a small exception being around the area of pavers we set in 4 years ago to connect the driveway to the patio for the fence gate. We have an in-ground sprinkler system we'll have to work around as well (and thankfully my husband knows how to repair them should we accidentally strike a pipe in the process... hopefully not!), but we also have a nasty downslope both toward the back of the yard and toward the right side (if you're standing on the porch looking back). I'll try to take some pictures and upload them later, but my questions pertain to the actual post placement options.
We're in an HOA neighborhood, so we would have to go through the ARC if we wanted to make a "permanent" fence, which we do not for both the reason of hassle and the plan to (hopefully) relocate within the next 2-3 years. Is there a way to sink the posts in a stable fashion that won't require cementing them? Our dogs are Pugs and therefore pose little risk to knocking the fence over were it not permanently embedded in the ground, but I'm not even positive such a thing is possible. Obviously it will need to withstand a growing boy's play time, too (he's only 16mos, so we've got a while before the real rough-housing starts!). I had a fleeting thought of using clay flower pots and somehow cementing posts into them, but that I can see getting dumped over with too-rough of play.
Any guidance on the matter would be most appreciated! Thanks!!