Reasons why dogs cannot eat plums:

1. The core is easy to choke. The fruit pits are swallowed directly by dogs. Some fruit pits are too large and may cause the dog to choke. Even if it can be swallowed successfully, the dog will not be able to digest it.

2. Fruit acid causes diarrhea. Plums are rich in fruit acid, which can cause irritation to the dog's stomach, leading to vomiting, diarrhea and other symptoms.

3. Easily poisoned. Plum nuts contain a certain amount of cyanide, which can easily cause poisoning in dogs.

Fruits suitable for dogs:

1. Banana. Bananas contain sucrose, which increases the number of beneficial bacteria in the intestines, speeds up digestion, and is beneficial to the dog's health.

2. Apple. Apples are rich in dietary fiber and pectin, which is good for eliminating toxins in the body.

3. Avocado. Avocados are rich in protein, vitamin E and lipids. The unsaturated fatty acids in lipids can help keep your dog’s hair shiny.

4. Watermelon. Watermelon can be added with water to relieve heat, but eating it will significantly increase the number of times the dog goes to the toilet.

5. Oranges and grapefruits: rich in vitamin C, which can replenish physical strength and help digestion.