The Mastiff with the Brass Warning

My hand went to the buckshot on the table. I had a plan, or something close to one: make the barn hard to enter and keep them out.

“They’re coming for the floor,” I said. “We’ll block the doors. If we can last until the authorities notice the communications outage, they’ll send someone to check.”

“Elias,” Evans said quietly. There was no comfort in his voice. What I heard instead was dread, so deep it seemed to drain the warmth from the barn.

I turned. He held his portable microscope in one hand and a clean glass slide in the other. His fingers trembled beneath the harsh lights.

“That makes sense on the surface,” he said. His voice shook. “But you’ve got it wrong. Completely wrong.”

I stopped with the shells weighing down my palm. “What are you talking about?”

Evans put the microscope aside, then reached for his digital blood analyzer. I had mistaken the object in his hand before; now the screen glinted in the light.

“At the clinic, you read the brass tag,” he said, glancing at the mastiff. “It said Asset 04. Return to Mark V. You told me Mark Vance.”

“That’s what I figured. Mark’s name.”

“No.” Evans’s face had gone pale. “I compared the synthetic lattice in the dog’s blood with my veterinary pharmacology records. It matches a classified viral-containment protocol. Mark 5. Mark V.”

The word containment settled in my stomach like a stone. “What does that have to do with the scars on his back?”

“I assumed they’d cut him open to put hardware in,” Evans said. “But think about his rear leg. He was dragging it across your yard this afternoon, before the snake struck.”

I remembered the limp. Mark had hit him with that timber post, and the dog had staggered away, still trying to move.

“The damage is neurological,” Evans murmured. “Those marks came from repeated spinal taps. They weren’t inserting equipment into him. They kept trying to take something out.”

I looked over. The mastiff had stopped circling the grate. He stood over it, head bowed, attention fixed on the darkness beneath the iron.

The phone call came back to me. “They said they were tracking Asset 04. But I tossed his GPS collar into the woods.”

“The collar wasn’t a tracker,” Evans said, edging behind the workbench. “It produced heat to keep his internal temperature down. It was meant to inhibit him.”

He paused, his eyes shifting to the dog. “And then that timber rattlesnake bit him.”

The memory came back hard and fast: Clara crying out, the mastiff throwing himself across her, the snake striking his shoulder.

Mark had stood over them with his shotgun, frozen. The dog shuddered violently after the bite, and I had thought the venom was doing it.

“He was shaking,” I said, barely above a whisper.

“The venom destroyed the synthetic suppressors in his blood,” Evans replied. Terror shone in his eyes. “The collar had been holding down his internal temperature. The suppressors were what kept the other thing contained.”

My face went cold. The dog’s strange behavior, the collar, those scars—each piece now seemed to point toward something worse than I’d imagined.

Evans lifted a shaking finger toward the mastiff. “When the suppressors were destroyed, the parasite woke. Asset 04 isn’t the dog himself.”

The dog turned his broad head from the grate. His gaze found us across the barn.

His eyes had changed. The brown was gone, replaced by an eerie green glow that seemed to shine from somewhere deep inside him.

“The parasite is what they were incubating inside him,” Evans whispered. He backed against the corrugated wall. “The venom woke it.”

The words seemed to fill the whole barn. Beneath the mastiff’s scarred coat, his muscles rippled and twitched, as though something inside him was pushing against the skin.

I tightened both hands around my shotgun until my fingers hurt. “Doc, what does that mean? Is he going to come after us?”

Evans shook his head. His analyzer slipped from his shaking hand and landed on the workbench. “I don’t know, Elias. Mark V is a viral-containment protocol.”

“They use a host like him to carry a parasitic organism,” he said. “His altered biology keeps it dormant while it develops. The suppressors kept it from taking control.”

I stared at the dog and tried to make the animal I’d rescued fit with what Evans was telling me. I couldn’t.

“The suppressors are gone,” Evans continued, wiping sweat from his brow. “It’s taking over his nervous system. If it gets loose from him, it could spread.”

My grip tightened on the gun. “Spread how far?”

“If it escapes that dog and reaches the outside world, Elias, it could infect this whole county.”

A harsh sound rolled through the barn. It came from the mastiff, low and grinding, and it wasn’t the rumble of a growl.

The noise seemed to come from somewhere inside his body, as if something were shifting against bone. Then he gave a sharp, wounded whine.

For one brief instant, the green light in his eyes faded. Brown showed through—frightened, hurting, unmistakably his. The dog was still fighting the parasite.