I grew up with Dachshunds. They do bark at everything. They think they are much bigger, so make a good guard dog, as long as no one can see them 
They are small, so don't like being surprised. We used to warn people to be gentle and not surprise them if they wanted to stroke them and not to stroke the younger cuter one who was more unpredictable. They are defensive, so although they will bark at everything, they only got snappy if cornered.
You have to treat them the same as you would a big dog, but we did pick them up and carry them in crowds and they were ok with this -probably felt safer.
I probably got bitten/nipped by the younger one when it was a puppy, and it did stop when it was older but the older one put up with a lot. The younger one did bite someone who visited and spent the whole weekend teasing it, then put their face in its face to say goodbye
. This was probably the worst bite.
They really like long walks with lots of things to sniff, like mouse holes, woodland etc. Useless at fetching sticks. Hate rain. Like a good tug of war with a duster 
The cat was boss
(They loved it when the cat had kittens)