Like many of Dario Argento's giallo films, while blood and gore is displayed in brutal fashion and often shown in copious amounts, it's intentionally stylized. The blood is very saturated in color (sometimes it even looks pink), and it pours unrealistically.
Real scene of two dogs fighting in a marketplace lasting several seconds. They have violent looks on their faces, one with their jaws hinged on the other's face without letting go, while they both thrash and snarl.
A lot of the violence is rather quick, but it is usually accompanied by a lot of blood.
A man's clothes get hooked onto a truck. It drives, dragging him across the road and eventually making his neck break on a sidewalk. His head is then squashed by an incoming car (offscreen). Fairly disturbing.
A woman is hacked several times with a meat cleaver (blood and injury detail closeups are seen). Her head is then smashed through a window; her neck sinks into the glass shards causing blood spurts. Most off screen.
A woman is beaten unconscious, then she is drowned in a bathtub of scalding hot water that burns and maims her face.
A man has his teeth broken by being thrown against a table and a piano; he is then stabbed in the neck.
A woman is stabbed offscreen and shown moments later with a knife in her abdomen (she is still alive).
A woman accidentally kills one of her pet birds.
In the film's opening scene, we see a stabbing in silhouette. The bloody knife falls to the ground. Later on, the scene is shown again but in full view.
A little girl impales a lizard on a needle. Although the scene itself is quick, the lizard is legitimately killed with no effects (similar to the actual snake death in "Friday the 13th").
A woman's necklace gets stuck in an elevator gate. The elevator moves up, causing the necklace to slice into her neck. It is heavily implied that she's decapitated, but this isn't shown.
Several somewhat disturbing images of dolls being hung, puppets with needles in them, and paintings that look like they were done by a child depicting violent and bloody acts.