Should I Get A Dog Or Not…if So Maybe A Havanese??

i am 19 years old and in college. i know i will have time to walk the dog but there will be some times when i am not at home. i dont want a dog who needs EXCESS attention like a yorkie or other hyperactive dogs that get bored really easily and i dont want a cat because i think they are too anti-social as well as shedding too much. i am also very allergic to most dogs so i wonder what kind of dog is good for allergy sufferers and is smart learns fairly quick, that likes to be active some times lazy other times. i want to buy a dog not a puppy because i do not have time to potty train this is also a problem because i dont know where to find a breeder with a teenage dog. i was thinking about getting a havanese or something similar…please give me any suggestions!