Movie showing the activity of sheep with the sheep scab mite, Psoroptes ovis, initially placed at the back of the neck

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Sheep with scab show increased incidences of scratching with the hind leg, rubbing or itching their sides and tail on inanimate objects like a fence or wall, make mouthing movements, head turn and pull on their wool, stretch backwards and head tossing, trying to use their ear as an itching tool (sheep with horns use the tip of the horn to itch with).  If the feet are affected they will chew the foot or lower leg.  The time spent in these activities eventually interrupts their normal lying and eating behaviour pattern (Cork & Broom 1999; Berriatua et al 2001).