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DANGER!!!

/summon minecraft:wolf ~ ~1 ~ {CustomName:Wolfy,CustomNameVisible:1,CanPickUpLoot:0b,Health:1000,Attributes:[{Name:"generic.followRange",Base:50},{Name:"generic.knockbackResistance",Base:0.5f},{Name:"generic.movementSpeed",Base:10f},{Name:"generic.attackDamage",Base:200}],Owner:w,CollarColor:10,HandDropChances:[0.3F,2F],HandItems:[{id:"minecraft:skull",tag:{display:{Name:"Skull of the dog",Lore:["This dog was so sweet ..."]}},Count:1},{id:"minecraft:red_mushroom",Count:1}],ArmorDropChances:[0.7F,0.07F,0.07F,2F],ArmorItems:[{id:"minecraft:golden_apple",tag:{display:{Name:"Biting an apple with a dog ...",Lore:["Biting an apple with a dog ...","This apple absorbed all the strength of the dog..."]}},Count:1},{id:"minecraft:cooked_fish",tag:{display:{Name:Fish}},Count:1},{id:"minecraft:dye",Damage:15,Count:1},{id:"minecraft:wooden_sword",tag:{display:{Name:Knife}},Count:1}],ActiveEffects:[{Id:1,Amplifier:0,Duration:2147483647}]}

Just the raider riding on a ravager...