Found this:
Non-toxic Substances for Dogs and Cats
The following substances are considered to be non-toxic, although they may cause mild gastrointestinal upset in some animals:
- Water-based paints
- Toilet bowl water
-
Silica gel
- Poinsettia
- Cat litter
- Glue traps
- Glow jewelry
http://www.meadowsprings.net/puppy_care.htm