>>What exactly is "arching"?
>>Also, the older dog is totally unsocialised. He is not used to other dogs at all. He has also gone after my own Lab, who is way bigger than him.
>>The older dog, I would say is part Yorkie (looks wise)
>>>>>>>>>>>>>
Dachshunds get killed at times by larger dogs, because I suppose they don't want to give in. With the other dog unsocialized and both of them male, it may be best to just keep them apart. There are some breeds of dog that just need this anyway, no matter what socialization they get. It can be done!
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Kathy Diamond Davis, author, "Therapy Dogs: Training Your Dog to Reach Others," 2nd edition, and the free Canine Behavior Series articles at http://www.veterinarypartner.com/Content.plx?P=SRC&S=1&SourceID=47