A thought I have, and this of course is one of my coping mechanisms that works for me at a rate of 85-99% (bad day vs good day) is to just talk. I have several friends that when I notice I am getting into one of my "moods" I can call or text and talk to until I have what is on my mind out and in the open.
I have had anxiety attacks on and off for 3 years now. I have also been...not well emotionally (am not going to put the exact term so as not to trigger anyone by accident). If I notice I am starting to get upset to the point of being in danger of an attack, or extremely depressed, I talk to one of my friends. And by getting what is on my mind off of it, I find that I tend to relax. My best friend of over 5 years has dealt with me from the time I first got depressed to this day, and I know that I can call him and yell or rant about whatever is on my mind and he will let me get it out of my system to where I am close to focused, and then I return the favor of his patience by letting him get his negative emotions out on the table as well. We have done this for the last 4 years and both of us being objective helpers, meaning we set our problems aside to help others figure out their problems no matter what, makes it to where this works for us very well.
My major issue is being an over worrier. I will look at every single negative outcome of a situation and by the time I realize I have pushed my boudary, most of the time I have gone too far. I have also figured out that when I find myself dwelling too much on a subject, I instead pick up a book, or my ipod and read. If I cant focus on what I am reading, I play a game. Or I go to a group of friends online that are also objective about their moods.
NOW while these are not appropriate ways for everyone to cope, or a person is not as blessed as myself in my friends, they are a couple ideas to think on, and possibly try a few variations, such as blogging, writing poetry (or a story if you so choose), role playing online (something else I enjoy doing as rping allows a chance for me to visualize what I would want to do and I have found that doing so actually helps me get through a few of my moods as well).
Also, I have a SDiT. He is primarily an alerter (more properly defined as a signal but medically recognized by most doctors as an alert) to my sugar levels (yes there is much debate over this matter but he has done this since 8 weeks of age and has been encouraged properly to do so.), and going to be trained for mobility counterbalance work, he also responds positively to early stress levels that normally end in an anxiety attack.
My therapist on my intake appointment, got to see the fact that he has naturally developed the ability to stay objective and find a way to get my focus on him and that shift in focus is enough for me to realize what is happening and use him as a focal point for grounding since as soon as he has my attention, I focus on our surroundings and his training rather than what was on my mind that got me close to my attack.
She was very pleased with seeing him work, and noticing that he did it at early levels and thus let me get back in touch before losing control of myself and told me flat out that just from that alone she is very pleased with me and my dog. He doesn't lose his head (most of the time. He does have his puppy days though), doesnt freak out when I do, finds a way to refocus me (usually a poke if standing or if we are sitting, setting his head against my knee thus soliciting my attention, and does, give me that little bit of a nudge to focus enough to realize where I am attack wise and if I am close, I can get to my "safe places" (my vehicle or bedroom, to where I can be isolated for the attack and know that I am not in danger when I do because of being able to lock the vehicle or close my bedroom door and be on my bed so that my incapacitation is not a problem)
NOW again this does not mean that you are going to be able to use your dog thus. I have trained myself to keep enough control of myself to get to that safe place, even if it means I have to focus on one thing to the exclusion of all other thoughts. I don't expect my dog to ground me. That is not his job and he does not have the capacity to do that as only I can ground myself. What he does do is provides that small signal that allows me to realize what I am doing and take proper steps to ground myself or if I find it hard to ground, get myself to a safe place to have my meltdown.
Be realistic in exactly what you want the dog to do for you. Write down a list of what you want that dog to do, and how you will implement other coping skills in response to what your dog has done. DO NOT!!!! expect the dog to be a fix all. I cannot stress this enough! I speak from the fact that I am OTing my dog, and that I have already developed the skills to cope with most of my issues and situations that they become a problem in. All that he does is help me realize sooner what I would realize eventually so that I can implement more of my skills easier than I normally can and have a higher sucess rate. He does the same thing that my friends have done.
Look at it this way when making your list, and yes I am going to use some of Kirsten and others' analogies here; Is this dog going to do something that another human or a robot, or your cell phone, or your ipod/computer could do for you? If not then its probably not feasible for the dog to do it. And when they say that it is VERY true. Any one of my friends can tell I am getting worked up and anxious before I can. My cell phone can provide a focal point for me to implement coping techniques by my being able to talk to or text one of my friends and talk it through. My ipod can give me that one thought/activity to focus on to the point that all else drains from me. My computer can allow me to be stimulated more to interact with my environment by my figuring out what to do on it, where to go, and why I want to do it. Mushu stimulating me to realize sooner, is amazing for me because I can then focus on what is at hand and not be stuck in my thoughts to the point that I cannot ground myself without the assistance of my friend or some kind of electronic device.