I ordered 2 of these - both of our lops love them. They are sturdy enough for our 5 and 6 pound lops to jump on top. They are fairly heavy and quite sturdy, but not heavy enough that your bunny can't happily flip it all over the place. One of our bunnies prefers playing with hers. The other prefers hiding out or hanging out on top surveying his kingdom. I would recommend and Overstock has the best price I found.
My bunny loves this item. She doesnt go inside as she is a larger bunny, like a small dog almost. But she loves to sit on top. We put snacks inside so she has to kida of work for them which my vet says is good for her brain. Keeps her entertained. The only thing is, as it is wood. She chews on it. Which is standard for about everything. (Bunny is no longer allowed near the piano) Also because it is wood, as bunnies tend only to relieve themselves in one corner.We learned very fast that if put near that corner, the bottom starts to rot as she enjoys peeing on it for some reason. Moving that awayfrom her relief spot solves that problem though. Other than the abuse my bunny puts on the item, it is wonderful!
The guinea pigs love it! It is big enough for one to get in and nap or lounge around. The only problem is that they potty inside (of course, their guinea pigs) and the wood is kinda stained, but doesn't smell.
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