Using silverhawk boots to passively train Agility does not give a chance of earning this item. When a player obtains the pet, they receive one of the following messages: In a purely mathematical format your chance of receiving a pet on any particular action is Where: * is the estimated completion time (in game ticks) of each course lap, since the pet can only be obtained at the end of a lap * is the virtual skill level. At 200 million experience, a flat bonus of 50 is applied to this value