Most dogs present with the sudden onset of loss of balance, disorientation, head tilt, and irregular jerking eye movements called nystagmus. A dog walking contract will outline the expectations of both clients and dog walkers before service begins.Create and download agreements for free! Head tilting usually occurs due to an abnormality in the vestibular system. Thomas Henry Huxley (4 May 1825 – 29 June 1895) was an English biologist and anthropologist who specialized in comparative anatomy. Simply Yours Concierge provides bonded and insured pet care services in Middlesex, Mercer, Monmouth, and Somerset Counties.