Honestly no, it's not right right. But I'll admit I do the same thing too. Where I work pets are not allowed inside because it is a health code violation. Every so often someone will come in carrying a small dog, usually I don't say anything because I don't want to deal with a customer fighting with me. You know "EVERYONE else lets me bring him here, no one has ever gotten upset about it before". So I figure they will be in and out within 5 minutes so it just isn't worth the trouble. However if it were a large dog on a leash I would say something. Why? Because I'd have to deal with many customers quickly running up to complain about the large dog in the store. I know I would have customers yelling that they would call the health inspectors. But a small dog is often unnoticed so I just choose to ignore it. However if someone were to sit down at a table with their dog I would tell them to go outside.