restless jack russell terrier barks and is afraid that he will be left alone.

jack russell terrier cute dog animal mammal mask restless barking alone separation anxiety pet energetic alert attentionseeking anxious vocal companion friend loyal territorial protective highstrung hyperactive nervous needy demanding active mischievous persistent stubborn tenacious determined fearless feisty aggressive vigilant watchful sensitive emotional clingy insecure impatient barks afraid left training alone