What was the first domesticated animal?
So far as is known today, the first animal to be domesticated by human beings was the dog. Dogs as we now know them were descended from wolves. Wolves themselves could not be completely domesticated, but when people selected the wolves that were most amenable to being around people, they eventually evolved into dogs. This process is believed to have happened around 30,000 years ago. After dogs, the next animal to be domesticated was the sheep. This was the first of what we would consider to be farm animals that people were able to domesticate.
So, human domestication of animals began with wolves, which eventually evolved, with help from people, into fully domesticated dogs.