I suppose if they both pushed on it at the same time that they might be able to knock it down, but I really doubt they would even try. We've used this for years at the sanctuary with various size buns (and at the 24"height too) and never had a bun jump over or knock it down. It is very sturdy. Because it's hexigon in shape, each individual panel actually reinforces the one next to it. Also I don't think the House Rabbit Soc would recommend their use if they felt there were or could be problems with the fencing being pushed oover......but knowing YOUR two...

The price looks very reasonable to me. I think I have the 42 inch one and I think the price is less than what I paid for mine. Do they have a store where you can actually look at one? Good luck!