Filaroides , Crenosoma and Angiostrongylus vasorum
These are types of lung worms found in the trachea
and lungs of K9's and other meat eating mammals worldwide.
This lung worm forms nodules in the bronchi and trachea
from the adult worms. They shed eggs into the
wind pipe which are coughed up and swallowed. Eggs pass out
with the feces the cycle then begins again with a new host getting infected by
accidentally swallowing the eggs by directly eating them or licking their paws or fur.
The life cycle is considered direct.
A lung worm in dogs in Europe,
China and eastern North America. Adults are again located in the bronchi
and instead of eggs, they release larvae which get
swallowed and pass out with the feces. These infect a
host usually a snail which is then eaten by the dog.
The Larvae then penetrate the gut wall into the blood vessels and
are carried to the lungs where they mature in the bronchi.
The worms can be found in the trachea,
bronchi and small bronchioles in dogs and other mammals from Europe,
Russia, Eurasia and North and South America.
The worms themselves are long and thin similar to
whip worms but are the same diameter.
The life cycle is also considered direct.
The adult of this particular lung worm lives
in the heart and major blood vessels
supplying the lungs, where it can cause a host of problems.
Left untreated, the infection can often be fatal.
This worm requires two hosts:
an intermediate slug or snail host, where larvae mature
to the stage that is infective for dogs; and a definitive
canine host, in which adult female and male worms live and reproduce
A dog or other canine is infected when it eats a slug or snail that hosts the larvae.
Grass that infected slugs and snails have crawled on, and water that they have been
in contact with are other possible sources of infective larvae.
Larvae that reach the intestine burrow through the intestinal wall
and begin to mature to adult worms in the lymph nodes.
Immature adults travel to the liver in the blood stream
and from there to the heart, where they establish themselves in the pulmonary artery
the artery that carries blood from the heart to the lungs.
They arrive in the heart about ten days after being swallowed.
Male and female adult worms mate and eggs are released
into the blood to be carried to the lungs.
Eggs hatch in the lungs and larvae break through into the air spaces.
The dog coughs, bringing larvae up from the lungs, then swallows them.
Larvae pass out of the dog’s intestine in droppings, One gram
of dog droppings can contain hundreds of thousands of larvae.
Slugs and snails that come to feed on the dog droppings
become infected, completing the life cycle.
The lung trematode parasites
are called lung flukes
in North America
These flukes are large,
and are found in cysts in the lungs. Each cyst usually
contains two worms that usually live as long as the host does.
Their life cycle is also indirect. Eggs are passed out
of the cysts into the lungs and are then coughed up and
passed with the feces. If they land in water they turn into
a swimming larvae that penetrates a snail.
The larvae goes through some changes.
The snail is eaten by a crustacean usually a crayfish
in which the parasite develops and infects
the dog or other carnivore when eaten. These then migrate through the
gut into the body cavity, then through the diaphragm and finally the
lungs where they pair up and are enclosed in a cyst wall for the rest of their days.
Keep dog feces properly cleaned up.
Do not allow your dog to drink stagnant water or dirty water in the field
(Bring fresh water with you on outings or hunting trips)
If snails or slugs are prevalent in your yard apply the
proper insecticide to rid your property of these host's.
Do not allow your dog to eat aquatic life forms (Crayfish,fish etc)
Keep lawns mowed, brush trimmed,
and leaf litter away from the home.
Keep trails or paths in wooded areas
on your property clear
John A Sampson I
00 + 1 + 989-662-6230 International
|Dog Lung Worms
"The Dog Training