It sounds like you're looking for academic or critical papers that explore how , and perhaps how those portrayals affect public perception, animal welfare, or the media industry itself.
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“Man’s Best Friend as Media Mascot: The Use of Dogs in Television Commercials to Elicit Emotional Engagement” Author: Rachel L. Holloway Journal: Journal of Popular Culture (2018), Vol. 51, Issue 3 Summary: Quantitative & qualitative analysis of how dog imagery increases positive brand association and content shareability. dogs are represented in entertainment content and popular
To understand why dogs elevate media, one must first look at the neuroscience of the viewer. Studies in neuroeconomics (the study of the brain’s decision-making process) have shown that viewing a dog activates the prefrontal cortex—the area associated with reward and empathy—faster than viewing a human face. Don't hide the dog