The borzoi coat is silky and flat, often wavy or slightly curly. The long top-coat is  quite flat, with varying degrees of waviness or curling. The soft undercoat thickens during winter or in cold climates, but is shed in hot weather to prevent overheating. 'Work' for hound breeds is done out of hearing and often out of sight of the human companion; it is an activity for which the dogs are 'released', rather than an activity which is 'commanded'.In terms of obedience, borzois are selective learners who quickly become bored with repetitive, apparently pointless, activity, and they can be very stubborn when they are not properly motivated.