Thinking about investing in one but they're like $150-200. I am sure it would have to be ordered so it would be a pain to have to return it. The dimennsions and bar spacings are all listed on the site, thankfully. So... THEORETICALLY it should work, but I'm skeptical.

http://www.richellusa.com/catalog/pet-products/gates


Trying to still work out something to do with my bi-level home situation. Potty training is still ongoing with mine as there is no way to block off rooms. Husband is getting QUITE frustrated, understandably... but I did ask him to help me build one and that hasn't happened in 6 months. So, if he isn't going to do that I'll probably buy one. I'm most interested in the ones with the gates. 

So, if anyone has used these what were your opinions? What model do you have? If you don't use these, what do you use?

I don't see bar spacing numbers, but some of the gaps look too big. I wouldn't trust any gap over an inch.  Alice is tiny, but she has gotten though a 3/4 inch gap, and Poppy could force her way through an opening about 1 1/2 inches.

THE DOOKS OF HAZARD

I use a Marshall's Play Pen as my gate.

The gaps are listed I think under specifications or additional information. I think I saw one that was 1 1/4. I have one ferret that is rather tiny, my girl Toki. Rambo is a beast there's no way he'd fit through something that small. Bear's in between so if I focus on Toki then I doubt that the others could take things.

Is there anyway to really test the sizes they can get through? Is measuring their head size of their skull a good gauge?