Yes, Dawn, this is true. The ingestion of play dough, depending on the formulation and circumstances of exposure, could potentially produce sodium or salt poisoning, and could also result in a gastrointestinal tract blockage if a large enough quantity is consumed. Homemade varieties tend to contain larger amounts of salt than commercial ones do, so the risk of poisoning can be higher. Because of this, we recommend that pet owners keep pets away while working with or making homemade play dough, and to also store the dough in a secure container out of their pets' reach.