Thinking abt getting our Doxie a play pal

Hello, my partner and I have had our mini doxie for a year and a half almost now and she is a bit of an anxious pup so we are thinking of getting her a pal, is there any breed anyone would recommend to absolutely get or to absolutely stay away from.

My partner loves the idea of a German Shepard, Lab, Retriever or Husky however I’m more interested in a Doberman, Pinscher, Italian greyhound or even another doxie.

Any help would be greatly appreciated!!