Crystal1, definitely wait and see what happens. I went from a house with a backyard to an apartment. I've been in the apartment since May and ::knock on wood:: I haven't had any complaints.
Despite Bailey's many behavior problems, she is surprisingly not much of a barker in the apartment. From a young age, I instilled in her that if you bark, all the fun stops. If you bark when playing, I stop playing with you. If you bark when I'm making your food, I stop preparing your food. She is my only dog and there are no other dogs in my building, so there's no other dog for her to bark along with.
She does bark when my neighbors are in the hallway and when the phone or doorbell rings. I'm still trying to get her to stop doing that, but other than those situations, she's pretty quiet.
She will look out the window and bark if she sees skateboarders or other dogs. My living rooom window goes down to the floor, so I had to tape a sheet (2 feet high) to the window, so she can't look out.
What I'm trying to say is there are ways to prevent their barking if you know what sets them off. If looking out the window makes them bark, then block their access to the window like I did. If he barks when you play, then end his play sessions and start playing when he is quiet. He'll figure it out sooner than you think.
If your dog's barking can't be controlled through prevention or training and you are getting complaints, then you can always considering bark softening (debarking). If that doesn't help and you must rehome him, contact a sheltie rescue in your area.
