Rats on Pet Science Dailyhttps://petsciencedaily.com/species/rats/Recent content in Rats on Pet Science DailyHugoen-usThu, 30 Apr 2026 10:00:00 +0000Optimism in Pet Rats: Stable Personality, Shifting Moodshttps://petsciencedaily.com/2026/04/30/rat-optimism-stable-personality-shifting-moods/Thu, 30 Apr 2026 10:00:00 +0000https://petsciencedaily.com/2026/04/30/rat-optimism-stable-personality-shifting-moods/A repeated-measures study using cognitive judgment-bias testing found that pet rats show both stable personal optimism and situation-dependent mood shifts, suggesting one snapshot test is not enough for accurate welfare assessment.