When it comes to describing someone or something that is quick of scent, there are a few synonyms that come to mind. One common synonym is "keen of smell," which suggests a heightened sense of smell that allows an individual or animal to quickly detect and identify scents. Another synonym is "discerning," which can refer to the ability to distinguish between different scents and identify them with ease. "Sensitive" is another suitable alternative, as it suggests a heightened awareness of smells and might be used to describe someone who is quick to notice even the slightest of scents. Finally, one might use the term "nose-guided" to describe an individual or animal that relies heavily on their sense of smell to navigate their environment.