The “pet effect” is the idea that having a companion animal will improve one’s physical and mental health. However, numerous studies have not found this effect to be a real phenomenon with a recent study from Tufts University being the most recent. The reasons for the mismatch between what people believe about the health benefits of pets and the negative results from research projects are unclear.
Citation Herzog, H. 2021 Are pets as good for us as we think they are? What does the science really say about the impact of pets on human health? Psychology Today Sept 9 https://www.psychologytoday.com/us/blog/animals-and-us/202109/are-pets-good-us-we-think-they-are