This cluster of papers encompasses a wide range of research related to the health, nutrition, and medical conditions of dogs and cats. It covers topics such as obesity, chronic kidney disease, diabetes mellitus, hypertension, nutritional assessment, urinary tract infections, prostate cancer, surgical procedures like ovariohysterectomy and laparoscopic surgery, as well as adrenal gland tumors. The research aims to improve the understanding and management of various health issues in canine and feline companions.