Symptoms. Most intestinal parasites do not show symptoms until the infestation has become severe. The symptoms of protozoan infections depend on the type of single-celled parasite involved and where in the body it lives and multiplies. It also is difficult to diagnose because it is such a small organism. Plus, the protozoa are very small, unable to be seen with the naked eye, a microscope is required. It can be a primary disease, or it can occur as a secondary infection in dogs with weakened immune systems. Since dogs infected with intestinal parasites can exhibit no symptoms or subtle symptoms that can be easily overlooked; the best way to ensure that your dog is parasite-free is to take him to the veterinarian at least once a year for check-ups. This parasite is the primary cause for amoebiasis, or amoebic dysentery, a colon infection marked by abdominal pain and diarrhea. Internal Dog Parasites. However, puppies and feeble adult dogs can suffer serious symptoms, such as: Watery and mucous-like diarrhea; Bloody diarrhea (in severe cases) Dehydration; Vomiting; Abdominal … ... People who contract babesiosis suffer from malaria-like symptoms. It causes as many problems for our pets as it does for humans. The extraintestinal amebic disease involves the liver mainly. Dogs with symptoms of ill-thrift or intermittent diarrhea should not be taken to dog classes, dog parks, or boarding facilities, or be working as therapy or service dogs until after completing treatment and cleared by a veterinarian to return. As a result, malaria is a common misdiagnosis for the disease. cryptosporidiosis "crypto"-acute diarrhea ... -parasitic infection with no cyst stage - transfered only thru intimate contact Your vet will always perform a physical and take a full history in an attempt to rule out any other potential possibilities for your dog’s symptoms. Beware of Protozoan Parasites. symptoms protozoan GI diseases-indigestion to dysentery-acute or chronic diarrhea. Your veterinarian will examine your dog and perform fecal testing. Many healthy adult dogs may show no symptoms. Protozoa that live in the intestines usually cause digestive system disorders including abdominal pain and diarrhea. Cryptosporidium are a protozoan parasite that affects rodents, dogs, calves, humans and cats.Infection with this parasites is known as cryptosporidiosis. ... -can infect dogs-person to person - seen in daycares. Protozoan parasites. Symptoms of parasites can vary depending on the type of parasite, where it lives and severity of infestation. These types of parasites are referred to as protozoa. One-celled protozoa called coccidia invade your dog’s intestines, causing coccidiosis, resulting in symptoms that may be mild to life-threatening.Opportunistic, internal parasites, coccidia thrive primarily in young puppies weakened by other infections and living in … Amoebiasis is a protozoan infection of the intestinal mucous membrane usually of the colon caused by a protozoan known as Entamoeba histolytica. Symptoms of Parasites in Dogs . it is a rising problem for dogs in this state. Heartworms enter a dog's bloodstream from the bite of an infected mosquito. Coccidiosis in dogs is commonly confused with intestinal worms because the symptoms are so similar.