What is the primary characteristic of an animal that is abandoned?

The primary characteristic of an abandoned animal is that it has been left without care arrangements. This situation indicates that the animal has been deserted by its owner or caretaker, leaving it without food, shelter, or medical attention. Abandonment reflects a lack of responsibility and care for the animal's well-being, which can have serious consequences for its health and safety. This definition aligns with the legal and ethical considerations surrounding animal welfare, highlighting that the absence of care is what distinguishes abandonment from other situations, such as rehoming or rescue efforts.

In contrast, the other options suggest scenarios where an animal is still receiving some form of oversight or assistance. For example, if an animal has been transferred to another owner, it is no longer abandoned as it is under new care. Similarly, being in a shelter indicates that the animal is still receiving care and support. Belonging to a rescue organization also signifies that the animal is under the protection of individuals or groups dedicated to its well-being, which again contradicts the definition of abandonment.