It is the only dog first aid kit that has a battery operated hair trimmer to properly prep the wound site prior to treatment, such as 'hot spots'. Since 'hot spots' are the third most common reason dogs are taken to the veterinarian, saving one trip to the veterinary office would easily pay for the cost of this kit.
One of the primary intentions of this kit was to provide essential and practical items to handle most minor first aid events and to keep it affordable. As a result a lot of thought was given to what are the essential items one needs in a dog first aid kit to handle the multitude of minor medical encounters. Some injuries such as minor cuts, scrapes or the beginning of hot spots can be treated at home on a first aid basis and that is the primary intention of this kit.
If you are looking for a good comprehensive First Aid book for both dogs and cats Dr. Bill would recommend, The First Aid Companion for Dogs & Cats by Amy D. Shojai.
It is important to point out that this first aid kit in no way replaces the need for emergency veterinary care.
Should there be any question about the nature or severity of an injury it is always best to contact your veterinarian or local emergency animal hospital for treatment.