Dogs are ideal hosts for a variety of parasites. Sniffing, slurping, chewing, and licking their way through trash, dirt, and poop, they are bound to pick up some unwanted guests. They may then pass these pests along to playmates or humans—and their owners—through grooming, snuggling, and other social activities. Roundworms, tapeworms, hookworms and whipworms are some of the most common parasites that wreak havoc on canines, especially puppies. These worms live in the digestive tract and are passed through feces. If your dog is displaying symptoms like diarrhea, vomiting, coughing, weight loss, or lack of energy, a veterinarian will likely suspect parasites and order stool testing to diagnose the cause.

A Canadian veterinarian posted a series of TikTok and Facebook videos in which he claimed that the dog dewormer fenbendazole cured his advanced lung cancer patient. This claim is unsubstantiated and has been denied by a cancer researcher and federal agencies.

In his video, Joe Tippens says he was diagnosed with Stage 3 lung cancer and was told by doctors that he had only months to live. After learning about a clinical trial for fenbendazole, which was being used to treat the parasite protozoa that caused his cancer, Joe decided to participate. He paired the dog dewormer with vitamin E supplements, CBD oil and an experimental cancer-fighting drug. Joe claims that out of 1,100 patients in the clinical trial, he was the only one who was cleared of cancer. He believes the dog medicine was responsible for his miraculous recovery and has promised to continue taking the dewormer. dog dewormer cancer