Slowly get your dog used to being alone by practicing short departures and absences.
Minimize affection and attention before leaving to avoid getting your dog excited/anxious.
Reward your dog for calm, relaxed behavior before you leave using treats and praise.
Leave puzzle toys, chews, or background noise like TV to distract anxious dogs when alone.
Crates provide secure spaces for dogs prone to separation anxiety. Make it positive.
Make sure your dog gets adequate exercise before being left to lower pent-up energy.
Punishing separations anxiety can make it worse. Stick to positive reinforcement training.