Footnote
1. Psychology Department, University of British Columbia, 2136 West Mall, Vancouver, Canada, V6T 1Z4. E-mail: scoren@psych.ubc.ca.

Supporting Material Follows Below

Change in Dogs’ Activity and Anxiety Levels on the Day Before an Earthquake (27 Feb. 2001)

Baseline data --based on 54 data points per dog (Sept 5/00-April 5/01—two observations per week, randomly distributed over Monday to Friday—break in data acquisition sequence over Xmas holidays)

Anxiety Change
Baseline 1.98 (0.11)
Pre-Quake 3.37 (2.03)
Difference 1.38 t(192)=9.47 p>0.001

Activity Change
Baseline 3.05 (0.13)
Pre-Quake 5.35 (1.35)
Difference 1.85 t(192)=19.02 p>0.001

Number increasing more than 2 Standard Deviations from baseline
Anxiety 95 (49%)
Activity 91 (47%)

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Ear shape effects

Anxiety Change
Pricked 2.47 (1.72)
Lop Eared 0.75 (1.93)
Difference t(191)=6.20 p>0.001

Activity Change
Pricked 2.97 (0.95)
Lop eared 1.19 (1.10)
Difference t(191)=11.35 p>0.001
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Head size effects
(Ranked based on breed sizes—select top and bottom third)

Anxiety Change
Smallest 2.22 (1.86)
Largest 0.96 (2.01)
Difference t(128)=3.72 p>0.001

Activity Change
Smallest 2.88 (1.12)
Largest 1.16 (1.26)
Difference t(128)=8.26 p>0.001