Scoring and weighting system
The elicited experts were asked to provide three types of information. First, they were asked to score the driver (as established inAppendix S2 ). For each driver, higher is the score more the driver have a chance to contribute to the emergence of the COVID-19 in pets. Note that uncertainty score was not asked due to lack of evidence-based data at this stage regarding the COVID-19 in pets. Secondly, experts were requested to weight each driver within a specific domain (intra-domain weight). This relative weight was determined using the Las Vegas technique (Gore, 1987). Briefly, experts were given a number of points to be distributed between the drivers according to their importance in the specific domain. If all the drivers of a specific domain would have been considered as equivalent by experts, each of them would have received the same number of points. Lastly, the relative importance of each domain was subsequently weighted by experts (inter-domain weight).