Yes. This pupper (usually) doesn’t get as big, so they’ll be in a better environment somewhere cozy with lower chairs or stairs taking them up the couch. They need a certain amount of exercise and stimulation to keep them happy. But for the most part, they’ll be exceptionally happy in an apartment.   Your neighbors may begin to complain if your pupper keeps yapping all day or decides to bark incessantly at the wind moving the curtains. This may make apartment living a little bit more of an extreme sport, especially for introverts. But, as long as your German Shepherd Chihuahua mix is happily occupied with toys or treats.