Communication is an essential component of the translation of learning theory into the practical control of the behaviour of dogs. A handler sends a signal (e.g. a command), to which their dog responds. This response is dependent on the dog's perception of the signal rather than the intention of the sender. Previous research has shown that a dog's response can be influenced by specific changes in the verbal and non-verbal qualities of signals (i.e. the commands) used, but there has been little scientific evaluation of what happens in practice. Therefore in a first study, 56 dog handlers were videotaped giving their dogs a "sit" command and the significance of verbal and non-verbal factors on response was analyzed. Two factors were associated with a significant decrease in obedience: the dog's attention to its handler and the handler giving additional verbal information preceding the actual verbal command. Based on these results, a second more controlled study was run with 12 dogs that were trained to a new ("uff", i.e. jumping onto a raised surface) and a known ("sit", "down" or "paw") command. Once trained to predefined criteria, dogs were tested for their responsiveness with each of three additional types of verbal information preceding the command: the dog's name, the dog's name followed by a pause of 2 seconds and a "novel word", i.e. a word with no established relationships in this context ("Banane"). The results suggest that the addition of the novel word significantly reduced response to both the known (p = 0.014) and the new (p = 0.014) commands. The name plus a pause preceding the command significantly reduced the response to the new command (p = 0.043), but not the known one. The use of the name before the command without a pause had no significant effect on performance. The dogs' ability to generalize learned commands from the training context to a new context was tested by going through the same procedure in an unfamiliar environment. There was a significant reduction in correct responses only to the new command independent of the preceding verbal information (name (p = 0.028), name plus pause (p = 0.022) and novel word (p = 0.011)). This suggests that dogs may have more difficulties generalizing a less well-established command than an already known command.

In humans, the personality dimension ‘sensory processing sensitivity (SPS)’, also referred to as “high sensitivity”, involves deeper processing of sensory information, which can be associated with physiological and behavioral overarousal. However, it has not been studied up to now whether this dimension also exists in other species. SPS can influence how people perceive the environment and how this affects them, thus a similar dimension in animals would be highly relevant with respect to animal welfare. We therefore explored whether SPS translates to dogs, one of the primary model species in personality research. A 32-item questionnaire to assess the “highly sensitive dog score” (HSD-s) was developed based on the “highly sensitive person” (HSP) questionnaire. A large-scale, international online survey was conducted, including the HSD questionnaire, as well as questions on fearfulness, neuroticism, “demographic” (e.g. dog sex, age, weight; age at adoption, etc.) and “human” factors (e.g. owner age, sex, profession, communication style, etc.), and the HSP questionnaire. Data were analyzed using linear mixed effect models with forward stepwise selection to test prediction of HSD-s by the above-mentioned factors, with country of residence and dog breed treated as random effects. A total of 3647 questionnaires were fully completed. HSD-, fearfulness, neuroticism and HSP-scores showed good internal consistencies, and HSD-s only moderately correlated with fearfulness and neuroticism scores, paralleling previous findings in humans. Intra- (N = 447) and inter-rater (N = 120) reliabilities were good. Demographic and human factors, including HSP score, explained only a small amount of the variance of HSD-s. A PCA analysis identified three subtraits of SPS, comparable to human findings. Overall, the measured personality dimension in dogs showed good internal consistency, partial independence from fearfulness and neuroticism, and good intra- and inter-rater reliability, indicating good construct validity of the HSD questionnaire. Human and demographic factors only marginally affected the HSD-s suggesting that, as hypothesized for human SPS, a genetic basis may underlie this dimension within the dog species.

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