对给定的两个句子进行对比分析。
句子A：“人们常常认为猫是孤独的动物。”
句子B：“狗是人类最忠实的伙伴之一。”
Sentence A: "People often believe that cats are solitary animals."
Sentence B: "Dogs are one of humanity's most loyal companions." 

Sentence A highlights the perception that cats are often seen as independent creatures that prefer solitude. In contrast, sentence B emphasizes the companionship and loyalty that dogs provide to humans.