Play-Doh is what is called a viscoelastic solid, intermediate between a true liquid and a rigid solid, so a dough is basically a suspension of solid particles in a viscous fluid. ... However the bonds between flocculated particles are weak (they're only Van der Waals forces) so at even moderate stresses the dough flows and behaves like a liquid. Dough, andPlay-Doh, are best described as non-Newtonian fluids