Can't change wolf attack damage

I've got a problem with this command:

/summon Wolf ~0 ~1 ~0 {Attributes: [{Name: "generic.movementSpeed", Base: 1}, {Name: "generic.attackDamage", Base: 1000}]}

It should spawn a wolf with extra speed and attack damage, but wolf(can be tamed) is only moving fast, it doesn't instantly kill mobs.
I tried also this:

give @a minecraft:potion 1 16384 {CustomPotionEffects:[{Id:5,Amplifier:50,Duration:10000,Ambient:1}]}

This potion works on everything except wolfs.