One of the great things about Schlumbergera, they are non-toxic to humans and pets. With that being said, obviously, you should not walk around eating your plant or feeding it to your dog for dinner. But, if there happens to be slight ingestion, there is no cause for concern. If your dog happens to eat the plant in excess, it can cause some stomach upset, but that will likely be the worst of it. Do, however, investigate what is in your potting soil of choice. Just because the Schlumbergera species themselves are non-toxic, you still need to be careful about what is in your soil because that could be.