Three possible answers:
Any of several carcinogenic or tetatogenic hetero cyclic hydrocarbons that occur as impurities in petroleum-derived herbicides.
Toxic substances.
You may also be asking about the dog breed, spelled dachshund. If you are, they are a breed of dogs that tend to be short in height and long in length. An popular, but improper name for them is "weiner dog".
dashunds are pernouced DOx-en some people put doxin
Dachshunds and doxins are the saame type of dog just different names for it.