A (non-zombie) dog is shown being among the zombies in a cutscene towards the beginning. It's not shown being killed but it's not saved either. It doesn't come up anywhere else in the game. There is also a scene at a butcher's with hanging carcasses.
Lots of strong objectification content. Female zombies who bite you go for the crotch area to look like they are giving oral, you get bonus points for taking pictures of cleavage with your camera, the male character looks at women during cut scenes in an pervy manner, sexual jokes are constantly made, and the female characters mostly dress revealing, including the zombies. During cut scenes, the camera likes to linger over the female body when they are introduced.
There's 'squelchy' sounds when Frank eats fruit and
**************SPOILERS***************
Isabela sniffs in the cutscene where she finds out her brother is dead
The secret intro on the title screen alludes to a mother and child dying, and survivor Leah who has just lost her baby can die if not escorted properly.
There is a child in the intro cutscene who is implied to have died, and there are several other children stated to have died off-screen, but there are no children actually present during the course of the game.
While not hung by the neck, in Crislip's Home Saloon, there are bodies hung by their feet with their heads decapitated. Professor Barnaby is also tied and hung around his waist during a story mission.
When one of the optional bosses dies (the policewoman) she starts spasming on the floor. I don't know if it's supposed to be seizure or a heart attack since it's not brought up
One cutscene before the game heavily implies the death of a child and her mother. Another character you can rescue lost her child to the zombies, and two of the bosses you fight were driven mad due to witnessing children dying to the zombies.
Professor Barnaby and Carlito both get kidnapped during story mode. If Frank gets attacked by a certain enemy, he can be kidnapped and brought back to their base.
You can take control of a car at various points in the game and run over zombies. There's also a few boss battles where the boss will try to run you over with a vehicle.