While a tiger and dog might coexist peacefully in rare cases, it is highly unlikely they will truly get along as friends or playmates.
Tigers are apex predators and view dogs, especially small breeds, as potential prey. Tigers are solitary, while dogs are pack animals, so their social structures and communication methods differ greatly. Tigers are also far larger and stronger, meaning accidental harm is possible even without aggression. Individual temperament varies, but reactions are unpredictable.
It is not safe or responsible to assume a tiger and dog will get along. Always prioritize the safety of both animals.