Some of the common ones are
Canine Parvovirus is a virus that attacks and strips the gastrointestinal tract causing severe bloody diarrhoea, uncontrollable vomiting, abdominal pain and is often fatal without treatment. Parvovirus is highly contagious. Unvaccinated dogs and puppies are at a high risk. Parvovirus is spread either, directly from dog to dog or from ground contaminated with faeces. The ground may remain infectious for several years. Thus, the need to avoid exercising your puppy where other dogs have been until fully vaccinated.
Canine Distemper is a contagious and very serious viral infection that affects dogs of any age but especially young puppies. It can be spread from nose to nose contact, and coming into contact with urine, vomit or faeces that are from an infected animal. It affects many body systems including the respiratory, gastrointestinal, nervous and lymphatic systems. Treatment is usually ineffective and the recovery rate is very low so it is very important to vaccinate your dog.
Canine Hepatitis is an often-fatal acute liver infection. The virus is extremely contagious and is spread in the faeces, urine, blood, saliva, and nasal discharge of infected dogs. Surviving dogs may suffer ongoing liver and eye disease.