Grapple is a wrestling move one can do unarmed, dogs & zombies would use it, grapple is an attack that deals minor damage but severely reduce the hit+dodge chance.
This would make wardogs less prone to getting killed and make zombie hordes more lethal.
Ideally the dog would have its own version of the attack with damage, whilst a human/undead grapple is less or non-damaging save for the debuff.
It would be interesting if this effect stacked (like a “dogpile”) but cost more stamina than a bite/punch