Wardog Armor - Spiked Armor

Spiked armor – Any armor made for a dog may be modified with blades and spikes.  Any armor so modified allows the dog to attack with a body slam attack which will cause 2d4 points of damage, but requires that the dog moves at least 10’ immediately prior to the attack.  Otherwise the armor causes 1d6 points of damage.    The cost to create spiked armor is 150% base cost of the armor.