* Looks physically similar to a pig? In that case, you might consider a peccary, a wild pig-like animal found in the Americas. They are smaller than pigs, have a more slender build, and have a distinct gland on their back.
* Shares some behavioral traits with a pig? For example, hippopotamus are known for their wallowing in mud, similar to pigs.
* Has a similar diet to a pig? Boar are closely related to pigs and share a similar omnivorous diet.
To give you a more precise answer, could you tell me what specifically makes you think of a pig? Is it the snout? The hooves? The body shape? The more details you provide, the better I can understand your query!