Animals, like humans, can also experience mental health problems, a viewpoint that has been previously overlooked or denied. In the context of societal development, there is a growing trend of keeping animals in captivity for various reasons. However, regrettably, there have been minimal efforts made towards enhancing the mental well-being of these captive animals. This essay aims to comprehensively explore the significance of animal mental health and its profound impact on both animal welfare and different aspects of human society. Furthermore, it provides compelling scientific justifications for prioritizing the promotion of animal mental health, with a specific focus on the detrimental effects of captivity on their psychological well-being. The essay also emphasizes the crucial role of animal mental health in fostering harmonious coexistence between humans and animals, promoting environmental conservation, and driving social progress. By shedding light on these interconnected domains, this essay aims to contribute to a more holistic understanding of the importance of animal mental health and advocate for its prioritization in various societal, ethical, and scientific contexts.