Allergy is not cancer
People allergic to dogs usually react to proteins in dander, saliva, or urine rather than the hair shaft itself. Hair can transport these allergens through the environment, causing respiratory or skin symptoms in susceptible people.
What about hydatid disease?
Echinococcosis is a parasitic disease, not cancer. People become infected by ingesting parasite eggs shed in the feces of infected canids. Good deworming, hand hygiene, safe food practices, and control of livestock-dog transmission are preventive measures in endemic settings.
Can hair carry other material?
Yes. Fur can collect pollen, dust, soil, fungal spores, or parasite material, just as clothing and shoes can carry environmental debris. Routine grooming, household cleaning, parasite control, and hand hygiene reduce ordinary exposure.
What should immunocompromised people consider?
The main concern is usually infection risk from certain zoonotic organisms rather than dog hair causing cancer. Individual advice should come from the person's physician together with veterinary preventive care for the pet.