Solutions to a dog that has eaten an apple core:

1. Induce vomiting. If you find that your dog has eaten the apple core not long ago and has not had time to digest it, you can induce vomiting by pressing the base of the dog's tongue or feeding it diluted soapy water or salt water.

2. Observe. If the dog eats a small amount of apple core and does not show any abnormal symptoms, it means that the poisonous amount may not be reached.

3. Drink plenty of water. You can feed your dog more water, dilute the toxic substances in the apple core by taking in a lot of water, and promote metabolism through excretion.

4. Feed ginger water. Feed your dog ginger water, which can neutralize and degrade toxins in your dog’s body.

5. Seek veterinary help. If it is found that the dog has obvious symptoms of poisoning after eating apple cores, it still needs to be sent to the doctor for examination in time after emergency vomiting. If vomiting is not successfully induced, gastric lavage may be required.