Most likely, you won't find an apartment that allows dogs. They're almost impossible to find.

If you have a dog that's used to being outside, a flat is a hard adjustment... it was very very hard on our dog. (We were in an apt for a year waiting for a villa) We got a second dog to keep her company and that helped a lot... Since the second dog has been mainly inside since she was a puppy, she is happier in the AC than playing outdoors:) but the first dog wants to be outside all day.

Also, certain breeds of dogs are very social and do not do well if left alone all day... many suffer from seperation anxiety (seriously)... so if you are thinking about getting a dog, but no one will be home during the day, it's not fair to the dog (plus who will train it not to have accidents in the house?)