There may be many reasons why a dog may be shaking at home. Here are some possible reasons:
1. Fear or nervousness: A dog may be shaking because of fear or nervousness. This may be due to their fear of certain sounds, smells or situations, such as thunder, strangers, unfamiliar environments, etc.
2. Cold: If your dog is in a cold environment, it may shiver due to hypothermia.
3. Disease: Certain diseases, such as colds, fevers, etc., may also cause dogs to tremble.
4. Nervousness: The dog may tremble due to nervousness, such as when waiting for the owner to come home or waiting for a check-up at the hospital.
If your dog trembles frequently or displays other unusual symptoms, it is recommended that you consult your veterinarian.