You underestimate the intelligence of your cat. Or rather you measure intelligence with an extreme human bias. What you consider intelligent behavior your cat may consider weird, and what your cat considers intelligent behavior is something you will never consider.

That said, I don’t think it is useful for philosophy nor science to consider intelligence to be the same thing as consciousness. In fact I would go even further and claim that intelligence is not a useful construct, neither for philosophy nor for science. Consciousness, on the other hand, I think is useful for philosophy, but not (as of now) for science.