No it is way too small

No. Get the pineapple bed for rats, it's basically the same thing only a bit bigger.

I have had Robo hamsters, but did not use this so I can only give an opinion. I have a Chinese Dwarf hamster now who does not chew much, other then on food. I will say was chewing or biting on the metal clips that you can use to put it in the cage, since hers is sitting in a corner she did not need those or the strings attached to them, so I cut them off. My hamster has a play pen with a plush bed similar to this, she sometimes does seem to chew on the bottom, inside...I think she is trying to make blanket type material when she does this as I use nesting material inside her strawberry..she has not been harmed from chewing on the other bed. I think it should be safe for your Robo, if I adopted another Robo or Campbell's dwarf, I would definitely buy it...but if I saw it being chewed to pieces, I would take it out. I also had a crown style bed (no longer made) I bought several years ago from PetCo that my hamster at the time was a Campbell's who chewed a lot, but never chewed on it. I think your hamster will like it, just be careful if he does chew.

No it's very small

Sorry but no.  My dwarf hamster fits comfortably in the strawberry.  I believe there is a pineapple that is larger, but I am unsure if big enough for s ferret.  Best wishes!

Most small animals do that! 

I have two young(ish) guinea pigs who adore this house. You can definitely use it for them

I'm not sure if the measurements are the same, but my rats love the pineapple hideaway just like this, so id risk the 5$ hit because they'll probably love it.