There are several ways pets can contract intestinal worms:

• Oral ingestion: Pets are infected when they ingest a parasite egg or larvae from a contaminated environment. These eggs then either mature into an adult worm in the intestinal tract or go into a state of dormancy.
• Transcutaneous: In this case, pets are infected when parasite larvae penetrate the skin and migrate through the bloodstream.
• Transmammary: Puppies and kittens often become infected with parasites when they nurse. This is because dormant larvae living in the muscles of mature pets become activated hormonally during pregnancy, migrating through the mammary system to the nursing puppies or kittens.
• Transplacental: Puppies can become infected with intestinal parasites in the womb when the mother transfers dormant larvae into her unborn young.
• Ingesting fleas: One kind of tapeworm is transmitted when a pet ingests a flea that contains  tapeworm larvae. Once swallowed, the larvae are released from the flea, then develop into mature tapeworms within the pet's intestine.
• Ingesting other hosts: Rodents, birds, and rabbits can serve as secondary hosts for many worms. Pets become infected when they consume these secondary hosts.
   

Federal (U.S.A.) law restricts this drug to use by or on the order of a licensed veterinarian. One dog receiving a single 10X dose had elevated SGPT 24-hours post treatment which normalized by day 7.

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