Yes they do.
They bite which is a cut that is irritating and can become infected and some carry disease
Yes, fleas can and do carry diseases that can infect dogs. The most common flea-borne disease of dogs in the United States is tapeworms. This is why a monthly flea/tick preventive medication is a good idea.
All fleas bite that is how they get their food, and yes frontline will kill any flea.
Fleas bite and could produce disease to people.
If they bite you they can cause itching and irritation depending on where they were before they got on to you they can also transfer disease from other people or animals to you. For example the plague was transfered by fleas from rats to humans.
could you put comet in your dogs bath water
An army of fleas attacked our dogs,explain it?
Well, fleas use to carry the bubonic plauge which killed 1/3 of the population in Europe that won't affect cats/dogs. If your /dogshas had fleas for a while it can become allergic to a flea bite and heavy infestation can cause annemia. but the chances are it will just cause the cat/dog some discomfort!
Some dogs can. Not all dogs.
Fleas primarily infest mammals such as dogs, cats, and rodents as their hosts, using their blood as a food source. They can also occasionally bite humans, although they do not infest humans as primary hosts.
Fleas make dogs suffer. They dont help one bit...
Fleas can transmit tapeworms to dogs, but not roundworms, hookworms or whipworms.