Lawbreaker?
How so?
Well, first and foremost, if you are commanding said creatures to kill something, they would then be considered your weapon in the matter. If you kill said target with your weapon, then obviously, you have their blood on your hands. Since your weapon was brought to bear with magic, it is now considered a lawbreaker action.
It has been already stated in the novels and the books, for that matter, if you summon a big bad demon and have it kill people, you will be getting the lawbreaker stunt from it. It is just an extension of your magic, and you are now using it to kill people.
Second, if you are controlling said creatures to attack people for you, you would then be getting into grey territory of the 3rd and/ or 4th laws. Some more open minded wizards may look the other way, but I know at least a few hard line Wardens that would have a bone to pick with you about it.
The other big thing is once you start using such mind control magic over creatures, why would you continue to use it only on such simple creatures? Why NOT just bend the will of the pathetic individual your getting into an argument with? Why not simple shatter his mind? The setting shows that black magic is black because of its tainting nature, not the simple fact that it breaks a law. Every action corrupts you in some way, making you into a person who will break that law again and again, because you are good at it, and it gets just so easy. Its truly addicting. The downward spiral to upgrading from animals to people would not only be easy, but it would be highly likely.
Now, another thing to mention. Unless you use a very gentle form of control, pushing the creature to be more likely to perform your desired action rather than forcing it to attack, there will most likely be a rather nasty sequence of events that follow. Using such an overt form of magic on the mind of a feral creature for instance. Strong magic that is used to control minds always ends up leaving some psychic scars. The result on a simple creature's mind would likely destroy it, unless proper care was given. Even if it was, the damage would still be done. Since the action taken against their mind was to be pushed towards an act of violence, the creature's mental state would leave them violent. They would seem like they were rabid, or overly aggressive, abused. The creature would most likely fall deeper into this kind of madness until its action's destroyed itself. If your find with the destruction and degeneration caused by your actions, then that's one thing.
But, leaving a wake of such creatures would be a very EASY trail to follow. Number of animal attacks increased, with little to no sign of rabies. Not to mention the very BIZARRE attacks, like a swarm of bats or rats. Overall, unless you travel a lot, using such a technique in your home frequently would be very reckless and dangerous to yourself. It would be like leaving a trail of breadcrumbs for the wardens, saying "I'm here, come chop off my head please!"
Now, for the actual summoning. This for the most part will be very difficult. Controlling a critter once its arrived isn't too hard. If you do it frequently you'll have practice, and will know what your doing and how to do it, obviously. But summoning for the most part doesn't work like an APB calling all Dogs, Calling all Dogs. Its normally much more personal, and individual. If you had the fur, or blood of a neighborhood dog, then that would be simple enough. Using that direct link, you could put a compelling notion in the animals head that it wants to come to you. But a similar effect to just any animal that fits the bill and is nearby just doesn't really work. There would be no way to truly compel on that scale, its just not how it works. The best I can think up, would be something more along the lines of creating a compelling reason for your desired creature to show up. For rats, maybe a strong sense of rotting, decaying food. It would probably also leave a horrific sent nearby. For dogs or wolves, maybe somehow creating a very powerful sense of a bitch in heat. This is a little awkward, and i'm not sure how you'd go about doing it, but it would at least present the possibility of working.
I personally think the best you could do would present a compelling reason for them to come, but you could not really Compel them to come, if you know what I mean, hehe..
EDIT: Just realized i didn't put a finisher on this, and also kinda thought of something else that could be done
Now, I think I though of a way you could maybe call some critters towards you. This actually kinda opens up a can of worms that I wouldn't like at my table, but might be helpful for you to work off of.
Rather than using a true summoning, which i'm pretty sure just flat out won't work.. I think using a form of mental control, psychomancy might. The same form of magic you'll use to control them, could be used on a much wider range to try to place a compel within the target creature type to come to you or to the area you are at. Now while this might work, the complexity would be another problem. The targeting of a very specific creature type might also pose challenge, but I don't think it should be that big of a deal. And while it may only truly effect the animals you are calling, I think the "call" might be felt by other animals, making them seem uneasy. Humans may even be able to feel it, but it would probably only amount to a small sense of fear or dread. An un-explainable feeling.
But the big reason I don't like this, is the simple fact that it could be brought to bear against humans, and just get horrible after that. While now that I think about it, mechanically, it seems very possible, I just don't like it... It also reminds me of certain events in one of the novels that involved a lot of people be Fuuuuuuuuuu'd and ... Hmm.. I think a fear eating WCV, but i can't remember, hehe...
Now, I know this is pretty much just a nasty wall of text, and I apologize. I haven't been able to write very well for a while now. Just having a problem articulating >.< Anyway, hope this helps a little bit, and answers a few questions. Hope i didn't dissapoint too much Masurao, haha...