Deafness (Acquired and Congenital)
Deafness can occur because of pathology of the mechanics of the external or middle ear (conductive deafness) or of the sensory receptors and cochlear nerve (sensorineural deafness).
Age of Onset: Clinical signs present by 6 weeks of age
Sex Predisposition: Any sex of animal can be affected
Clinical Course:
Clinical signs worsen over time
Clinical signs worsen over time
Clinical Signs:
Behavioral/Mental Awareness
Abnormal vocalization
Barking for a prolonged time
Loud vocalization
Unresponsive to vocal commands or auditory stimulus
Easily startled by physical stimulus
Cranial Nerves
Deafness
Behavioral/Mental Awareness
Abnormal vocalization
Barking for a prolonged time
Loud vocalization
Unresponsive to vocal commands or auditory stimulus
Easily startled by physical stimulus
Cranial Nerves
Deafness
Inner ear (cochlea), cochlear nerve, brainstem
Increased prevalence in Border Collies with white or merle coat pigmentations and blue iris pigmentation
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