The tapeworm is transmitted to dogs (and cats) that ingest fleas -- as apparently fleas think tapeworm eggs are real tasty -- or hunt and eat wildlife or rodents infested with tapeworms or fleas. If you were to see an entire tapeworm you would notice that they are arranged with a small head at one end and many tiny brick-like repeating segments making up the rest of the worm.
Tapeworms can reach 4 to 6 inches in length within the intestine. Each tapeworm may have as many as 90 segments (!), though it is the last segments in the chain that are released from the worm that can be seen in the stool or attached to the fur under the pet's tail.
Many cases are diagnosed simply by seeing these tiny terminal segments attached to the pet's fur around the anus or under the tail; they even move around a bit shortly after they are passed and before they dry up and look like little grains of rice or confetti. It also these segments of the tapeworm which contain the eggs.
Tapeworms cannot be killed by the typical generic, over-the-counter wormers. So don't waste your time and money on non-prescription medication, see a veterinarian for a treatment that actually works.
Prevention is always the best medicine. See your veterinarian for flea prevention year round.
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