Dogs can have white chocolate.
White chocolate is not as dangerous to dogs as dark chocolate is.
However they should not eat too much of the white chocolate as the fats and sugars can be harmful to dogs.
The darker and more bitter the chocolate, the more dangerous it is to dogs when they eat it.
White chocolate on the other hand rarely poses any threat of chocolate poisoning to dogs with only 0.25 mg of theobromine per ounce of chocolate.
Even if the amount ingested is not a toxicity concern, dogs can still become ill from the fat and sugar in chocolate.
Compared to milk or dark chocolate, white chocolate is not nearly as toxic to dogs.
However the white chocolate is high in fat, which can cause similar symptoms to chocolate poisoning (like vomiting and diarrhea) and the high-fat content puts your dog at risk for pancreatitis.
All but impossible for a dog to overdose on.
Approximately 47 pounds of white chocolate for a 10-pound dog, 95 pounds of white chocolate for a 20-pound dog, and 145 pounds(!) of white chocolate for a 30-pound dog all would require a call to the vet.