Sites like Amazon carry several books on dog and/or pet first aid; just go to Amazon and enter 'pet first aid' as a search topic. The Red cross produces a booklet and also many branches offer classes in animal first aid; more info here:

http://www.redcross.org/article/0,10...2_4395,00.html

This link has information on some cavalier related health issues and also, towards the end, has the items that should go into a first aid kit for your dogs:

http://www.candog.com/cavaliers/Heal...POTPURRI96.htm

Another first aid kit for dogs:

http://www.canismajor.com/dog/fstaidk.html