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Veterinary behavioural medicine is marked by inconsistency in the naming and description of animal behavioural disorders, potentially hindering research and reducing the clinical utility of diagnoses. Sources of diagnostic inconsistency are suggested and parallels with human psychiatry are identified. This paper questions the use of categorical models as the basis for classification and reviews criticisms of categorical approaches in psychiatry. Evidence is presented to suggest an inconsistency between discrete categories and the structure of animal behavioural disorders. The potential benefits of exploring alternative models are discussed. It is concluded that it is important to move away from an approach based on advocacy and towards objective assessment of all available data. Existing diagnoses should be viewed as hypothetical constructs, with the underlying hypotheses being identified and subject to investigation. It is emphasized that global communication, empirical investigations and critical review are necessary for the development of a solid scientific basis within veterinary behavioural medicine

Animal. --- Assessment. --- Behaviour,classification,categorical models,diagnosis,dimensional models,spectrum models. --- Behavioural disorder. --- Classification. --- Clomipramine. --- Common mental-disorders. --- Communication. --- Development. --- Diagnosis. --- Dimensional classification. --- Disorder. --- Dogs. --- Dsm-iv. --- Experience. --- Human. --- Investigation. --- Medicine. --- Model. --- Models. --- Paper. --- Personality-disorders. --- Psychiatric classification. --- Psychiatry. --- Psychopathology. --- Research. --- Review. --- Spectrum. --- Veterinary.

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Prenatal stress (PS) can produce profound and long-lasting perturbations of individual adaptive capacities, which in turn can result in an increased proneness to behavioural disorders. Indeed, in PS rats there is evidence of impaired social play behaviour, disturbances in a variety of circadian rhythms, enhanced anxiety and increased hypothalamic-pituitary-adrenal (HPA) axis reactivity. This study was designed to experimentally investigate the degree of reversibility of PS-induced disturbances of social play and HPA reactivity by assessing the effect of the enrichment of the physical environment on PS rats during periadolescence. PS subjects showed a reduced expression of social play behaviour and a prolonged corticosterone secretion in response to restraint stress, but both these effects were markedly reversed following environmental enrichment. Interestingly, the enrichment procedure increased social behaviour but had no effect on corticosterone secretion in nonstressed animals, indicating a differential impact of the postnatal environment as a function of prenatal background. As a whole, results clearly indicate that rats prenatally exposed to stress can benefit during periadolescence from the modulatory effects of an enriched environment. Moreover, they confirm that PS may well represent a suitable animal model for the design and testing of new therapeutic strategies for behavioural disorders produced by early insults

Adolescence. --- Adult-rats. --- Animal model. --- Animal-model. --- Animal. --- Animals. --- Anxiety. --- Behaviour. --- Behavioural disorder. --- Circadian rhythm. --- Circadian rhythms. --- Circadian-rhythm. --- Circadian-rhythms. --- Circadian. --- Consequences. --- Corticosterone secretion. --- Corticosterone,distributed pregnancy,therapeutic strategy. --- Corticosterone. --- Design. --- Disorder. --- Enriched environment. --- Enriched. --- Enrichment. --- Environment. --- Environmental enrichment. --- Exposure. --- Expression. --- Function. --- Hpa axis. --- Hypothalamic-pituitary-adrenal. --- Juvenile rats. --- Maternal separation. --- Messenger-rna. --- Mice. --- Model. --- Open-field behavior. --- Physical. --- Play behaviour. --- Play. --- Prenatal stress. --- Prenatal. --- Rat. --- Rats. --- Reactivity. --- Response. --- Restraint stress. --- Restraint. --- Rhythm. --- Rhythms. --- Secretion. --- Social behaviour. --- Social interactions. --- Social play. --- Social. --- Strategies. --- Strategy. --- Stress.