Why does my dog drool excessively when left alone, even for short periods of time?

Here are some possible reasons and additional factors to consider:

1. Separation Anxiety:
   Dogs are social animals, and some can become extremely anxious when separated from their owners.  Dogs with separation anxiety may lead to symptoms such as drooling, pacing, whining, barking, destructive behavior, and even attempts to escape.
   
   
2. Stress and Anxiety:
   Other forms of stress and anxiety can also cause excessive drooling. Changes in routine, a new environment, or loud noises might trigger anxiety in dogs.
   
   
3. Nausea:
   Anxiety can sometimes lead to nausea, which can cause a dog to drool excessively.
   
   
4. Dental Issues:
   While not directly related to being left alone, dental problems like gum isease, tooth decay, or oral infections can cause drooling. If your dog only drools excessively when alone, this is less likely, but it’s worth ruling out.
   
   
5. Gastrointestinal Issues:
   Stress can sometimes exacerbate underlying gastrointestinal issues, leading to drooling.
   
   
6. Medical Conditions:
   It's important to rule out other medical conditions that might cause drooling, such as neurological issues, poisoning, or a foreign object in the mouth.

What You Can Do:

1. Behavioral Training:

    

    
   Gradually acclimate your dog to being alone by starting with very short absences and slowly increasing the duration.
   Use positive reinforcement to reward your dog for calm behavior when you're preparing to leave and when you return.
   
   
   

2. Provide Comfort:

   
   Leave a piece of clothing with your scent to comfort your dog.
   Create a safe, comfortable space with their favorite toys and bedding.
   
   
   
   
3. Exercise and Mental Stimulation:
   Ensure your dog gets plenty of physical exercise and mental stimulation before you leave. A tired dog is less likely to become anxious.
   
   
   
   
4. Interactive Toys:
   Provide interactive toys or puzzle feeders that can keep your dog occupied and distracted while you’re away.
   
   
   
   
5. Consult a Veterinarian:
   If the drooling persists or worsens, consult your veterinarian to rule out any underlying medical issues and to discuss possible treatments or interventions for separation anxiety.
   
   
   
   
6. Professional Help:
   If behavioral training and environmental changes don’t help, consider consulting a professional dog trainer or a veterinary behaviorist.
   
   

Addressing the root cause of your dog's anxiety or stress is crucial for their well-being and can help reduce or eliminate excessive drooling when they are left alone.