The zombies aren't concerned with the dog and only attack humans. The dog is used as a major plot point when he's sent to get supplies to another human. The dog is with the survivors at the end when they find an island that turns out to be overrun with zombies, but it's not clear what happens to the dog or the human survivors.
one of the male security guards makes an inappropriate sexual comment to a woman they are holding at gunpoint so there's sexual harassment but not necessarily assault
There's one scene in the beginning of the movie where we se a woman get attacked in the back of a vehicle, she's lying on her back and it can trigger someone who struggle with this one.
Some of the zombies are graphically disfigured, with missing limbs or bloody damage. One little girl zombie had her lips bitten off and teeth are exposed. The zombies' skin looks leathery or rotted later in the movie.
Double leg fracture. Heavily implied by a cracking sound, the character being in pain and having to be literally dragged away by someone else.
No exposed bones on the scene.
In the uncut version, when the main case tries to cut through a part of the zombie horde, one particular headshot causes the eyeball of one of the undead to go flying with a mild amount of slowmo to make it noticeable.
Define 'excessive' in a 21st century zombie film. There is indeed lots of gore, but is any of it excessive? As in, more than needed? I don't think so at all.
One of the most likable protagonists is a police officer. There are also three security guard characters in uniform. One of them is a good guy, while the other two are creeps. One is power-hungry and abusive, the other shows a lack of empathy and sexually harasses one of the other main characters.
Towards the end, a character tells the others to leave on a boat while he stays behind due to infection. He puts a pistol to his head and a shot is heard off screen.
Technically, no one is overtly referred to as suffering from it (if I recall correctly), but if PTSD behavior is a trigger for you, be aware that pretty much every character in the film is essentially dealing with some degree of PTSD by the time we meet them, and for the duration of the film. They each have experienced horrifying, devastating trauma by the time they get to the mall together, and their choices and actions and behavior reflect their grief and anxiety and paranoia throughout the film.
It's not strobe lighting, but there is a montage of news reports with zombies and the way the film was edited (to make this montage look glitchy) there are many quick cuts and this has the potential to trigger more photosensitive viewers. (Approx timings of this sequence is 10m45s - 13m20s
There are no scenes showing a living mother giving birth to a dead baby. However... a baby is born undead, having turned zombie inside its zombie mother's womb. Technically, it is certainly not alive, but it IS undead, moving and making noises, so...?
There is a scene where people are exploring their sexuality, a man tries on women's heels and is admiring them however no one makes jokes or brings it up.
[spoiler] it ends with the group landing a boat on an island that's over run with zombies and though their fates aren't clear, it doesn't look great for their chances