Smrobs covered a good amount of info.
I'm glad I've never had to deal with any real emergenicies so far ~knock on wood~ but I did have a friends horse go down at the trailer for no apparent reason.
The main thing if an emergency happens is to stay calm. If you are panicked you are not going to be able to think straight. It sounds easy but believe me it's not haha. Phantom and another horse got into a kicking fight in the trailer and Phantom got the bad end of it. His back legs were all cut up. It took all my strength not to scream and freak out. It looked like something you would see in a horror movie but remember this....."Everything on a horse looks 10x worse than if it was on a person, and everything on a WHITE horse looks about 100x worse than it actually is." Found that last part out while looking at Phantom's legs. They were cut up and I though for sure it was gonna be bad. Hosed him off and he was fine. They stung and there was one kinda deep one but none required anything other than a washing and some topicals. Heh it's funny even when Phantom gets coggins pulled and there is a little blodd from where the needle is, it looks as though someone took a knife to him since he's white the blood shows up A LOT more. haha
Just keep your cool and try to remember everything.
I have a few veterinarian books that I would highly reccomend:
The First is "The Complete Equine Veterinary Manual"(new edition) by Tony and Marcey Pavord . It has charts in each section that list the disease, the symptoms, what it is doing to the horse, and treatment. It also has TONS of good pictures. I absolutely love this book.
Example of what the chart can say(obvisouly i can't make a chart on here but I can show you what is said based on the disease, injury, problem, etc)
Section: Diseases affecting the foal
Disease: Septicaemia (aka sleepy foal disease)
Symptoms: loss of appetite, fever, depression, then coma and death.
Course: Infection via placenta which rapidly spreads through the bloodstream; development depends on the foal's level of immunity derived from colostrum.
Treatment: Immediate commencement of course of antibiotics, intraveinous fluid probably required, good nursing essential.
~~is this the type of thing you're looking to know~
Another book would be "The Comprehensive Guide to Equine Veterinary Medicine" by Barb Crabbe, DVM.
This is really good too it goes really in detail about pretty much everything. For each disease/injury, ect it says; What it is, treatment, diagnosis, how serious is it?, and it even mentions potential complications.
IMO both books are really good to have.
Hope I helped =) even alittle
~ Hope is never light years away ~