Are the calla Lilies dangrouse for dogs?

Hi, I am planning to grow the calla lilies in my garden as I have seen them in my friends house and very impressed by them. But I have also listen and read about the dangers of Calla Lilies for the dogs. Currently, I own a Labrador dog, and also discuss with my one of the top dog breeder about this issue. But He is not much assure about it. I think you people can answer well about this issue as you have the knowledge about the different plants. Please let me know your thoughts about this plant. Thank you!