It seems to be the way these pet chains operate, as well as most businesses today. I had a manager tell me he'd call me next week. A week passed and so I called him, as I just wanted to know if it was still a possibility (even down the road) or not. I was told, "Oh, yes! I'm so sorry -- I'm right in the middle of something. But I will call you RIGHT back."
So I waited for 3-4 hours by the phone and there was no phone call. Then a few more days and still no phone call.
I'd at least appreciate someone saying, "I'm sorry, I've decided to offer the job to someone else; We don't really feel your background is right for the position at this time," ect., ect.
But don't expect to get that courtesy.
From what I can see, unless they are calling YOU, you're not getting the job. And I wouldn't hold my breath waiting, especially if you call and get strung along with no kind of indicator on how it might proceed.
I've found this is how most employers operate. I don't know if they're deliberately being mean, or if they figure this is a way to let you down without having to hear the disappointment in your voice. Either way, it's unprofessional. Just tell people the truth and give them a time frame for when a final decision will be made. If that time frame passes, then you know you didn't get the job.