Fact 1: Male dogs use pheromones in urine to mark their territory.

Fact 2: For a male, urine markings are used to define the boundaries of their territory.

Given the two facts above, answer the question "What do the pheromones in male dog urine used for?" with the following options: 
- Animal survival
 - define boundaries
 - poison predators
 - competition
 - competing for resources
 - detract enimines
 - animal transport
 - camouflage sent


 

  define boundaries       