List signs associated with aggressive behavior in dogs.

1. Growling or snarling
2. Baring teeth
3. Stiff body posture
4. Raised hackles
5. Lunging or charging
6. Biting or snapping
7. Prolonged staring
8. Excessive barking
9. Blocking or cutting off escape routes
10. Showing dominant behavior such as mounting or humping
11. Resource guarding (protecting food, toys, or territory)
12. Chasing or herding behavior
13. Pacing or restlessness
14. Tail held high or wagging stiffly
15. Raised tail with a curled tip
16. Dilated pupils
17. Ears pinned back
18. Excessive drooling
19. Rigid or tense body language
20. Repeatedly ignoring commands or cues.

- Growling is a warning sign that your dog is feeling threatened or aggressive. It's important to pay attention to the context of the growl to understand why your dog is growling.
- Snapping is a more serious sign of aggression than growling. It's a warning that your dog is about to bite.
- Biting is the most serious sign of aggression. It can cause serious injury to people or other animals.
- Stiff body posture is a sign that your dog is feeling threatened or aggressive. The dog's body will be tense and rigid, and its tail may be tucked between its legs.
- Ears back is another sign that your dog is feeling threatened or aggressive. The dog's ears will be pulled back against its head.
- Dilated pupils are a sign that your dog is feeling aroused or aggressive. The dog's pupils will be large and dilated.
- Hackles raised is a sign that your dog is feeling threatened or aggressive. The dog's hair on its back and neck will be raised.
- Lunging is a sign that your dog is about to attack. The dog will lunge forward and may try to bite.
- Chasing is a sign that your dog is feeling aggressive. The dog will chase after people or other animals.