We’re only more complex in that we have language systems so can assess situations in a more detailed way. The majority of the time we have pretty much the same instincts and responses to stimuli to many other animals because, in short, it takes less energy/effort. Being able to conceive society, something canines can do, doesn’t stop other natural instincts. There is a level of simplification, yes, but this is a social media post, not a scientific study so it won’t explain every minute detail!
Looks like a Rose Chafer, Cetonia aurata. If you’re not in the UK/EU it could be a similar species. Wikip. say North American rose chafer, Macrodactylus subspinosus for the US.