We are currently fostering a 3 month old Jack Russell Terrier (female) and, contrary to my preconceptions about JRTs, she is super calm, snuggly and quiet. She does bounce around sometimes, but calms down easily. She hasn't barked once, and doesn't nip or anything. We're really loving having her around, but wonder if she'll keep this calm demeanor or if she will take on more of the over-excitable nature known in JRTs. Thanks for your help!