9. Italian Greyhound
Italian Greyhounds represent a unique blend of ancient sighthound speed and delicate companion dynamics. These slender dogs possess a sensitive nervous system and thrive in warm, predictable environments alongside their human caretakers. Due to their low tolerance for environmental stress and high emotional dependence on owners, Italian Greyhounds frequently struggle with solitary time, exhibiting tremors, distress vocalizations, and house-training regression.