There are two types canine minute virus (CPV1) and CPV2. There are variants of CPV2 called CPV-2a, CPV-2b and CPV-2c.
Generally, the first sign of CPV is lethargy. Secondary signs are a loss of appetite or diarrhea followed by vomiting. Diarrhea and vomiting result in dehydration that upsets the electrolyte balance and this may affect the dog critically. Secondary infections occur as a result of the weakened immune system. There are two types of canine parvovirus called canine minute virus (CPV1) and CPV2. CPV2 causes the most serious disease and affects domesticated dogs and wild canids. There are variants of CPV type 2 called CPV-2a, CPV-2b and CPV-2c. A: CPV-2c causes similar signs as those seen with infection with CPV-2, CPV-2a and CPV-2b. These include loss of appetite, vomiting, diarrhea (which may be bloody), and dehydration. The bloody diarrhea might be mild or absent with any of the variants, but affected dogs are more likely to stop eating. Canine parvovirus type 2c (CPV-2c) is a variant of canine parvovirus. It was first detected in Italy in 2000, and has also been reported in Western Europe, Asia, and South America. There are two types of infection of parvo a dog can acquire, intestinal or cardiac, and the severity varies greatly. Some dogs show no symptoms, yet die within 72 hours. More commonly, in less volatile strains, the mortality rate is just 10%. Symptoms include vomiting, diarrhea, lethargy, fever and a loss of appetite. Dogs with parvo can survive with quick intervention but for some the healing process can be very slow. Many dogs suffer no serious long lasting effects from the virus but there is now a new strain that has been recently discovered. The virus that causes the disease known as “parvo”, canine parvovirus type 2 (CPV), first emerged among dogs in Europe around 1976. By 1978 the virus had spread unchecked, causing a worldwide epidemic of myocarditis and inflammation in the intestines (gastroenteritis). Canine parvovirus (CPV) is a highly contagious viral disease of dogs that commonly causes acute gastrointestinal illness in puppies. The disease most often strikes in pups between six and 20 weeks old, but older animals are sometimes also affected. Parvo, or canine parvovirus (CPV) infection is a relatively new disease that appeared for the first time in dogs in 1978. Because of the severity of the disease and its rapid spread through the canine population, CPV has aroused a great deal of public interest. CPV-2b is associated with the most severe disease. A distinct type of parvovirus (CPV-1) has been found in pups with diarrhea and in normal dogs. CPV-1 is not believed to be an important cause of disease. Most dog owners are familiar with canine parvovirus. However, the virus referred to as parvo is one strand, CPV2. The other strand, also referred to as canine minute virus, is less known. Parvoviruses are a relatively small virus, consisting of a protein coat around a single strand of DNA. A: CPV-2c is the most recent variant of canine parvovirus type 2 (CPV-2), the virus that causes parvo enteritis in dogs. There are several variants of CPV-2; all of the variants of CPV-2 are genetically related. CPV-2c differs from CPV-2a and CPV-2b at only one point on the DNA strand. Canine parvovirus type 2c (CPV-2c) is a variant of canine parvovirus. It was first detected in Italy in 2000, and has also been reported in Western Europe, Asia, and South America. Canine parvovirus type 2 (CPV2, colloquially parvo) is a contagious virus mainly affecting dogs, and thought to originate in cats. The current belief is that the feline panleukopenia mutated into CPV2. Parvo is highly contagious and is spread from dog to dog by direct or indirect contact with their feces. There are two types of canine parvovirus called canine minute virus (CPV1) and CPV2. CPV2 causes the most serious disease and affects domesticated dogs and wild canids. There are variants of CPV type 2 called CPV-2a, CPV-2b and CPV-2c. The general symptoms of parvovirus are lethargy, severe vomiting, loss of appetite and bloody, foul-smelling diarrhea that can lead to life-threatening dehydration. Parvovirus is extremely contagious and can be transmitted by any person, animal or object that comes in contact with an infected dog's feces. 
https://en.wikipedia.org/wiki/Canine_parvovirus https://www.avma.org/public/PetCare/Pages/Canine-Parvovirus-FAQs.aspx http://dogparvosymptoms.net/ http://www.vet.cornell.edu/baker/about/articles/CanineParvovirus.cfm http://www.vcahospitals.com/main/pet-health-information/article/animal-health/parvovirus-in-dogs/853 http://www.vetinfo.com/types-canine-parvovirus.html https://www.avma.org/public/PetCare/Pages/Canine-Parvovirus-FAQs.aspx https://en.wikipedia.org/wiki/Canine_parvovirus http://pets.webmd.com/dogs/parvo-parvovirus-dogs
what are the types of parvo?