Involuntary muscle trembling dogs | petmd, Tremors in dogs . tremors are involuntary, rhythmic and repetitive muscle movements that alternate between contraction and relaxation, usually involving to-and-fro. Dogs head shaking & itchy ears | nzymes., When dogs are frequently 'shaking their heads', this is a strong indication of itchy ears. this may be an early indication of an internal digestive disorder - that. Tremors/shaking dogs - page 1 - petplace., Tremors are rhythmic, to and fro involuntary movements that persist through the waking state. true tremors stop during sleep. there are a variety of causes of tremors.