Fig 3.

a. Factor Analysis of the dog owner questionnaire identified two constructs. Exploratory Factor Analysis (EFA) was performed on half the data to identify factors which were tested by Confirmatory Factor Analysis (CFA) on the other half. Of the five identified factors, the first two were identified as potential constructs. These constructs were named “Dog owners’ attitudes towards brushing their dogs’ teeth” (BrushAttitude) and “Dog owners’ assessment of their dogs’ dental health” (DentalHealth) and coincided with constructs predefined by the authors KBE and AP. Variable loadings are shown for both EFA and CFA. Detailed information on variables and variable/factor (co)-variance is available in S2 Table. 3b. Factor Analysis of the veterinary health practitioner questionnaire identified two constructs. Exploratory Factor Analysis (EFA) was performed on half the data to identify factors which were tested by Confirmatory Factor Analysis (CFA) on the other half, resulting in two potential constructs. These constructs were named “Veterinary health practitioners’ attitudes towards dental chews and dental feed” (ChewFeed) and “Veterinary health practitioners’ attitudes and opinions on dental problems and dental cleaning” (Cleaning). Variable loadings are shown for both EFA and CFA. Detailed information on variables and variable/factor (co)-variance is available in S2 Table.