As a marketer who's always been interested in tech startups and that has dealt with many engineers, those ideas scream "engineering." The problem is finding startup ideas from an engineering point of view has in my experience been the best way to find a solution in search of a problem.
"AI for Communicating with Dogs": sounds like a "hop on the AI bandwagon idea". I don't believe the idea in itself is silly at all (getting people to empathise with animals is probably a net good), but presenting it that way is a guaranteed way of not being taken seriously, and, more importantly, a guaranteed way of limiting your options when trying to solve the actual problem. Why does it HAVE TO be done with AI?
"Smart Bathroom": Why? Why not start from the desired outcome? We're going to collect more data to do what?
Etc. etc. Most of those ideas (there are a few exceptions) are driven by a product/widget-centric vision that doesn't seem to have any deeper justification.