The videos shown here are original footages taken from the practice of Aycardo Veterinary Center Inc (AVCI). Users are free to link to any of these videos as long as AVCI is recognized as the author of these items.


Sarcoptes scabiei is one of the major mites causing mange in dogs. This parasite is host specific but can cause disease in aberrant hosts including humans. Sarcoptes is an obligate parasite with the entire 21-day life cycle occurring on the host. Infestation is associated with intense pruritus. Alopecia, papules and crusts with secondary self-trauma occurs primarily on the pinna, elbows and hairless areas. Diagnosis may be difficult even after multiple skin scrapings and a presumptive diagnosis is often made by response to therapeutic trial.


Demodex canis is one the major mites causing mange in dogs. It is thought that small numbers of Demodex canis are part of the normal flora of canine hair follicles. Although the exact pathogenesis is not understood, it is generally accepted that there is a specific abnormality of T cell immunity which allows proliferation of the mites in young dogs. Diagnosis is by demonstration of increased numbers of adults or immature stages of Demodex canis on skin scrapings and hair pluckings.


This video illustrates a Dipylidium caninum egg packet. Dipylidium caninum is one of the many tapeworms infecting animals. Tapeworm affecting dogs only is Taenia pisiformis, while that of cats only is the T. taeniaformis. The illustrated Dipylidium caninum egg packet affects both dogs and cats.
Dipylidium infection is flea-vectored. Flea maggots pick up tapeworm eggs in dog or cat feces. Transmission is when adult fleas are ingested by dogs or cats.


Dirofilaria immitis is the cause of canine heartworm disease. It is endemic in most temperate and tropical coastal zones in the world. Affected animals are often between 4 and 7 years of age although the condition has been diagnosed in animals less than one year of age.
The microfilaria shown in this video is the first stage larvae. When a mosquito bites an infected dog, circulating microfilariae are ingested and develop into third stage larvae (L3) which migrate to the mouth parts of the mosquito. The third larval stage of the heartworm stage enters the subcutaneous tissues of the host via a bite from an infected mosquito.