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FCI mobile app usability guideline are finally available here
"The most common usability problem was the tap target size on most interfaces. All of the adult cats were clearly frustrated—even hissing—after accidentally closing the apps they were using."
"Our initial research with feline users has provided a baseline of FCI guidelines. As always, we recommend that you conduct your own user testing if you’re designing for cats. Given this target audience’s reputation for being notoriously independent-minded, they’re less likely than humans to be accepting of bad design."