It's important to consider that:
* Dogs don't generally like spit: Spit is often associated with unpleasant experiences, like being sick or having something stuck in their throat.
* Individual dog preferences: Just like people, dogs have individual preferences. Some dogs may be more curious about things like saliva than others, but that doesn't mean they necessarily "like" it.
If you see your Chihuahua licking or trying to lick something that seems like spit, it's more likely they are:
* Exploring their surroundings: Dogs use their mouths to learn about the world, and licking is a common way to investigate things.
* Seeking attention: Some dogs will lick to get your attention, especially if they are bored or want something.
* Grooming themselves: Dogs will lick themselves for hygiene purposes.
If you're concerned about your Chihuahua's behavior, it's always best to consult with your veterinarian.