Actually, Teresa's recommended cage sizes are the same as those of the SPCA and other organizations -- 7.5 square feet for one pig as a minimum, 10.5 preferred. See this link:
https://www.guineapigcagesstore.com/about-candccages. And if you poke around in her other stuff, you'll find the same standards for the other organizations.
I've never seen 4.5 square feet recommended as a minimum by anybody except the people who manufacture and sell pet store cages. I'd like to see your references on that.
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