1、 Dog breed and age Dogs of different breeds and ages require different types of dog food. Small dogs need higher protein and fat content than large dogs because of their higher metabolic rate. Older dogs need lower protein and fat content because of their slower metabolic rate. When choosing dog food, make sure to choose the right dog food for your dog's breed and age. 2、 Dog weight and activity level The weight and activity level of a dog can also affect the choice of dog food. Dogs with larger body sizes and high levels of activity require more energy, and therefore require higher protein and fat content. Dogs with smaller body sizes and low activity levels require less energy, and therefore require lower protein and fat content. When choosing dog food, it is important to determine the protein and fat content of dog food based on the weight and activity level of the dog. 3、 Quality and composition of dog food The quality and composition of dog food are also very important. Dog food should contain high-quality protein, fat, and carbohydrates. It is best to choose dog food that does not contain large amounts of artificial additives, preservatives, and pigments. In addition, dog food should also contain essential vitamins and minerals to support the dog's health and immune system. 4、 The taste and taste of dog food The taste and taste of dog food are also important factors. The taste of dog food should be attractive to dogs, and the taste of dog food should be suitable for the taste and preferences of dogs. Some dogs prefer dry dog food, while others prefer wet dog food. Therefore, when selecting dog food, it is necessary to determine the taste and taste of dog food based on the taste and preferences of the dog.