I finally came across a copy of Ron Loewinsohn’s 1983 novel Magnetic Field(s).
First three paragraphs, which I read a few minutes ago in a sweat:
Killing the animals was the hard part. “All you’ve got to do,” Jerome had told him, “is keep your cool. There isn’t anybody else’s cool you’ve got to keep, and there isn’t anybody else who will keep yours.” The first time it happened—he had already gone with Jerome five or six times—they were in this backyard when this little black dog (a Scottie?) started yapping up at them and he froze in the first moment and in the next felt his body want to move back over the fence, the way they’d come. But Jerome had simply reached down to pick up a brick that formed part of a kind of border around some flowers—it was all one smooth motion—and bashed in the dog’s head with one good one, and then gave it one more to make sure, the second one making an awful sound as it went into what was left of the dog’s head. There were just these four little legs attached to this furry black body, and where the head had been was just this turmoil of hair and blood and meat and one piece of jagged bone and one eye where it shouldn’t have been, not even not looking at anything, just there; and he looking down at it till Jerome touched him on the chest and then motioned toward the window with one jerk of his thumb.
The first time he’d had to do it himself, they had just stepped into this backyard at the end of the driveway and suddenly there was this big setter—just as surprised as they were. He started to feel himself wanting to turn back out of there, hearing the blood rushing in his ears and thinking he did not want to do this as he reached back, his hand closing around the cold shaft of the tire iron in his back pocket. Behind him Jerome had stopped. He reached out his left hand, offering “something” to the dog, which leaned forward to check it out at the same time that it began to pull its lips back away from its teeth. He brought the tire iron out and down in one sweeping arc into the animal’s head. It actually made a dent in the head and felt something, at first, like hitting a rolled-up rug, except that now there was this dog lying there with its different legs crumpled under it or sticking out in a way that nothing that was alive would lie that way. He just stood there a long moment, looking down at that furry body, hearing himself breathing and hearing the dog not.
Killing the animals was the hard part because they tended to get under his skin; they reminded him of him. Their bodies were complicatedly thick, so that hitting this skull was nothing at all like hitting a rolled-up rug, or a log, things that were solid, the same all the way through. They were made of all those layers of skin and bone and organs, all of which he thought of as easily bruised, especially the organs. They moved like him, they wanted things, they wanted, and they were scared and furious.
Biblioklept 