Hi Marlene,
If I’m understanding this correctly, your Dachshund is urinating in the house and on the couch when he is left alone. This sounds like a case of separation anxiety. As behavior is a complicated problem, there is no easy one-step solution. But before we can commit to this as a diagnosis, I would recommend getting a urinalysis done to help rule out medical problems, such as a UTI or bladder stones.
A vest/thunder shirt for dogs can be a part of behavior modification therapy but on it’s own it likely won’t work. Behavioral modification can be a long, involved process and requires commitment on your part. Many people are afraid of crate training, but when used properly, the crate can be a safe haven for your dog. In addition to the crate, a Thunder Shirt, and some modification on both you and your pet’s part, some medication may be necessary as a bridge to improved behavior.
After you meet with your veterinarian to rule out medical problems, they should be able to sit down with you and develop a more specific plan for your pet’s needs or they should be able to at least direct you to someone who can.
I wish you the best of luck as I know these behavior cases can be an uphill battle.
Dr. Ryan Llera