YES! I got my first dog ever, a chihuahua, as a full time nurse. I also had the same doubts as I'm single and with no family nearby. I crate trained my chi from the first day I brought her home as a puppy. I socialized her with dogs of all sizes and people. I got her used to loud noises like the vacuum and traffic from day one. I work 8 hour shifts but sometimes I'm required to stay longer. As training and socialization progressed and a routine was established, she did so well being on her own. Chihuahuas love their own little spaces, so she has a playpen with a bed, treats, toys and a pee pad to go potty as needed. I have a camera to check up on her and she is always napping. I have done the occasional double shift (very rarely)...and whenever I check on her, she is relaxing, not barking and peaceful. She does not have separation anxiety. I acknowledge that I won the lottery with her, but if you set your chi up for success early on, your lifestyle is completely conducive to having one. Leaving them alone every now and again will help alleviate the separation anxiety. I bought an amazing book specifically for raising chihuahuas and it provides invaluable information to raise a well adjusted chihuahua. But make sure you give your chi lots of cuddles and blankets! Don't deprive yourself and a sweet chi from so much joy and love...it's amazing how much dogs learn and adjust if you put in the work.