The key elements in the Hudson and Rex origin story are numerous. Firstly, there's the setting where they come from. Maybe they are from different training backgrounds, with Hudson having his police training and Rex his canine training. Their first interaction is vital, whether it was friendly or a bit rocky. Then there's the aspect of how they adapt to each other. Hudson has to learn Rex's signals and Rex has to get used to Hudson's commands. The first real test or case they face together is also a key element as it shows how they start to function as a team and rely on each other.
One key element is their initial meeting. It was probably a situation where they were brought together for a specific task. Another element is the discovery of each other's abilities. Hudson would have noticed Rex's great skills, and Rex would have sensed Hudson's leadership. Also, the development of trust between them is crucial in the origin story.
In the Hudson and Rex origin story, the key elements include the circumstances of their pairing. It could be that there was a shortage of resources or a particularly tough case that led to them being teamed up. Their different personalities also play a part. Hudson might be more methodical and Rex more instinctive. As they learn to work with these differences, it becomes an important part of their origin. And of course, the first case they worked on together, which set the foundation for their future partnership.