Dogs can acquire group A streptococcal bacteria from infected children. Group A streptococcal bacteria is what causes the condition known as strep throat. However, in dogs, the bacteria most commonly produces no symptoms or only a very mild sore throat.
Dogs do not usually get sore throats similar to humans. In dogs, sore throats are usually a sign that a more serious disease has been acquired. Sore throats may also occur if the dog has an infection in the mouth, sinuses or anal glands.
Some pediatricians believe that dogs can be asymptomatic carriers of streptococcal bacteria and pass it to children, causing strep throat in children. While theoretically possible, this scenario is considered to be very unlikely.