Dogs can see colors, but they can see fewer colors than humans. This is because dogs have only two types of cones in their eyes, while humans have three. According to the principle of three primary colors, the colorful world seen by human eyes becomes pale in dog eyes. Dogs can mainly see yellow, blue, and gray colors.

Foods that can improve dogs’ vision:

1. Tomatoes. Tomatoes have a great protective effect on dogs’ eyes. Tomatoes effectively protect dogs’ eyes from sun damage.

2. Pumpkin. Pumpkin is good for the dog’s urinary system, helps digestion, can control weight gain, and is also helpful for the dog’s eyes.

3. Sweet potato. Anthocyanins, which are rich in beta carotene and have antioxidant and anti-inflammatory properties, are not only great for your dog’s eyes, but they also promote digestion and are very beneficial to your dog’s body.

4. Carrots. Not only can it help your dog’s hair grow beautifully, but it can also make your dog’s eyes healthier.

5. Blueberry. It can not only improve the dog's night vision function and reduce fatigue, but also supplement vitamin C and other substances.