Why did the lively dog suddenly become behaving?

A lively dog suddenly becomes well-behaved. You need to pay more attention to whether the dog's mental state is normal and observe whether the dog's mood changes due to illness.
Several factors that cause mood changes in dogs
1. Hormone balance is disrupted, and dogs are prone to mood swings after completing contraceptive surgery
2. After strenuous exercise, dogs will become very calm after venting their excitement and inner entanglements
3. After being forced to wear clothes, the body cannot move freely. If they feel disgusted, their mood will change. , basically in a declining state
4. The dog will stop playing after hearing the sound he cares about and concentrate on listening to that sound
5. The dog will hurt someone It will also become very quiet after moving to this place to relieve pain
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