The evidence itself is compelling, linking a specific gene to body fat % in dogs, and also identifying genetic variants in humans associated with BMI at this gene region. The article is overall a good summary but in my view conflates the specific findings (that a gene involved in energy homeostasis in dogs and humans affects obesity in both species) with a broader over willpower. A co-author is quoted in the article saying "This goes for dogs and humans alike - they have a genetic drive to overeat" which is not the conclusion of the study cited (the actual effect size of the genetic variants on BMI in humans near this gene are comparatively small).