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Purchased for our rats home and we loved it...however, I was later on informed (when mentioning about purchasing the larger one) that guinea pigs have been known to die in these by them collapsing and by them getting stuck by a wall and suffocating. Please beware for guinea pigs and for that reason I only gave a 3 star rating as it DOES still do what I need it to for my rats and I have never had a problem.
Cool tunnel, but medium size was very disappointing. Shows adult guinea pigs & ferrets on pictures, so I thought it would be perfect for a small hedgehog. It's definitely at max capacity for size for our hedgehog. She gets stuck very easily, and she's only a baby/youth still. There is no doubt we will need to upgrade very soon to a larger one as she has doubled in size alredy in 2 weeks :(
These fun tunnels are great, my hamster loves hers. HOWEVER, they sell these for $10 at most pet stores. I was really disappointed when I saw that, but I had already opened it and gave it to my hamster so there's no returning it.
Hard to tell from the picture how big the inside of the tunnel would be. The medium is better for hamsters, gerbils, smaller critters. It was too small for my adult guinea pigs and that would be the same for rabbits. I would say, to look for the large size for dwarf rabbits, rats and guinea pigs. Otherwise it's a fun toy for the critters so not bad.