What are the two main types of canine joints?

The identification of the two main types of canine joints as diarthrodial (synovial) joints and amphiarthrodial joints reflects the critical classifications based on their structure and functionality. Diarthrodial joints, commonly known as synovial joints, are characterized by a synovial cavity that allows for a wide range of motion, making them vital for activities involving flexibility and movement in dogs. Examples include the shoulder and hip joints.

Amphiarthrodial joints, on the other hand, are slightly movable joints where the bones are connected by cartilage or ligaments. These types of joints provide stability while allowing for limited movement, which is essential in certain areas such as the vertebral column.

Understanding these classifications is crucial for recognizing how a dog's skeletal system allows for mobility and flexibility, which are essential for their overall health and physical abilities. The other options focus on specific joint structures or types but do not adequately encapsulate the broader categories of joint classification relevant to canine anatomy.