I would get a dog no bigger than him. Daschunds can have back problems so you wouldn't want a larger dog jumping on them and tumbling with them. Also, I would focus more on what type of dog will fit your life style. If you're not home a lot, you don't necessarily want something that needs a lot of exercise, training, mental stimulation, or grooming...

I would go for another little dachshund. Gorgeous little dogs and they do seem to like others of their own kind Good luck.

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Have you thought of going to a rescue and seeing what they have that they feel would e a good match for your dog. They will help with a few introductions to ensure your dog seems fine with the rescue one. Also you would be giving a dog a wonderful new chance in life . Good luck on you decession.