If leaving the house sets off barking, start smaller. Step out for a few seconds and come back calmly before you try a longer exit. Keep those first practice goodbyes short and boring.
The product page this note eventually points to is a rechargeable ultrasonic bark deterrent from about $34.99. It is listed for dogs about 6 months to 8 years with reward based training. It is a store page, not a separation training course, and it makes no promise to end every bark.
This is a practice tip, not a sales pitch. Stop and ask a skilled trainer if your dog seems frightened by being left.
General education, not veterinary advice.
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