I would let the dogs out at night and watch the rabbits run away and simply jump the 9 inch fence between the rungs, no problem. Since I actually watched them hop it a few times, I was guessing that 21 inches would be enough to prevent them from getting in. They might be able to clear 21 inches if it were out in the open, but since they also have to aim through the vertical rungs I'm hoping this will be tall enough to stop them. The whole point of having an attractive aluminum fence is so you don't have to have this wire mesh or chain link. I think at 21 inches tall, it's still subtle enough that the overall impression of the fence isn't too tacky.
This spring, I'm not messing around, I bought the same kind of fence from last time: 16 gauge black vinyl coated welded wire fence with 2"x3" rectangles. I used zip ties to hold it in place, just like last time. With a little help from my super handy room mate, we installed it in a couple hours.
Of course after the fence was in place, it only took the rabbits a day or so to find the gaps around the bottom where they could just duck under and get in. So then I took a spare piece of fence and stuck it into the ground temporarily blocking the low spot where they got in.
|Rabbits found the low spot, and slipped under the temporary block with this spare piece of fence. My next step was to dig the tongs 3 inches into the ground and add some fill to actually raise the ground level in this spot.|
As you can see from the photo, they actually dug under that and bent the tong back that was touching the ground. Arrrg! That does it! I cut off a strip and stuck the wires 3 inches into the ground and had extra rectangles at the top, then I filled that in with some left over soil and sod scraps to actually raise the level of the ground up to the fence. So far so good, no rabbit poop in the yard since adding the bottom layer in these particular low spots.