Adopt and do not buy.  There are so many dogs waiting to be adopted, and guess what?  I think they never never forget you adopted them, and they are usually very grateful.
I obtained this girl from San Diego Chihuahua Rescue.  Her name was River, but I changed it to Mija.
She is a complicated dog.  She gets mad quickly, like everyone else in my family.  She does a lot of warning barks if something makes her nervous.
She was not affectionate when I obtained her, but she is getting better.  Now she often likes to be in my lap, but before, she sat off to the side.
One of my kids cannot believe I did not take her back, but the point of a rescue is to rescue.