Dog Fleas, Bugs and Parasites. Dog Flea: The flea is a wingless dog parasite (which makes it easier for us to fight it), that has a flat body, which permits it to hide between the dog's hair and has huge mouth tweezers to suck blood. This parasite stays in the dog's body as long as it feeds itself which is usually an hour.
http://www.k9puppydogs.com/html/dog_skin_care.htm
Insects bite canines for a variety of reasons. Some bugs, such as fleas and mosquitoes, bite dogs in order to feed upon their blood. Others, including bees and spiders, bite or sting as a defense mechanism. Either way, when bitten, a dog will develop swelling at the site of the bite or sting.
http://www.petwellbeingwiki.com/wiki/Dog_Bug_Bites/
As a result, a dog suffering from fleas may require anti-flea medication that will either kill the fleas or disrupt their lifecycle. In addition to such treatment, the methods used to relieve the symptoms of many other types of bug bites can also be employed in order to relieve itching and irritation.
http://www.petwellbeingwiki.com/wiki/Dog_Bug_Bites/
In order to pinpoint bug bites as the source of a dog’s irritation, a veterinarian will look for the presence of any of the above symptoms. By observing the actual site of the bite or bites, a practitioner will be able to identify the type or class of insect that is the cause of your dog’s trouble and irritation.
http://www.petwellbeingwiki.com/wiki/Dog_Bug_Bites/
For example, many dogs are plagued by fleas, which are small, wingless insects. Fleas are external parasites that feed upon the blood of animals such as dogs. Typically, a dog’s coat will be infested with numerous fleas at one time, rather than just a single flea.
http://www.petwellbeingwiki.com/wiki/Dog_Bug_Bites/
Types of Parasites that Affect Domestic Dogs. Canine parasites can be classified into those that live on the outside of a dog’s body (external parasites) and those that spend all or most of their time inside of their host (internal parasites).
http://www.petwave.com/Dogs/Health/Parasites.aspx
While many types of canine insect bites can be treated in a similar fashion, flea bites will likely require specialized treatment. This is due to the fact that the presence of flea bites usually means that a dog is carrying many of these pesky bugs in its coat.
http://www.petwellbeingwiki.com/wiki/Dog_Bug_Bites/
1 The only problem is that fleas can generate a type of resistance to them. These collars can also produce allergies and can also cause hair loss. This product does not depend on quality of the product but on the dog's reaction to it.  The tablets sterilize the fleas, therefore the cut their reproductive cycle.
http://www.k9puppydogs.com/html/dog_skin_care.htm
The most common types of external parasites that affect companion dogs are: 1  Fleas: Tiny, wingless, blood-sucking insects that are an annoyance to people and their pets.  Flies: Bothersome external parasites that cause irritation and disease in our pets.
http://www.petwave.com/Dogs/Health/Parasites.aspx
Parasites that Affect Dogs - Definition & Types. Definition of Parasites. Parasites are organisms that spend most of their lives on or inside other animals and always gain some advantage from that relationship. Common external parasites of dogs are fleas, flies, mites, ticks and lice. Internal parasites that frequently infest dogs include roundworms, hookworms, tapeworms, whipworms, threadworms, heartworms, giardia, coccidia and flukes. Dogs never benefit from parasites.
http://www.petwave.com/Dogs/Health/Parasites.aspx
what type of bugs do dogs have
Dogs have fleas, bugs and parasites.   Fleas and parasites are the types of bugs which dogs have.