Como é a Visão de um Cachorro?

Uma dúvida comum é se o cão enxerga em cores ou em preto-e-branco e a verdade é que eles têm a capacidade de enxergar cores, mas não da mesma maneira que nós. Para os cães, as cores verde, amarelo, laranja e vermelho não têm diferença nenhuma.
Muitos estudiosos crêem que o cão enxerga um tom de amarelo quando olha para as cores vermelho, verde e amarela, e seria exatamente por isso que ele não conseguiria diferenciá-la.

Em resumo, os cães enxergam cores, mas com menos matizes e menos precisão que nós, que conseguimos diferenciar cerca de 10 milhões de cores e combinações diferentes

Por outro lado, eles tem a capacidade de perceber tantos tons de cinza que é quase impossível testar completamente este talento, em função de nossas próprias limitações.
A explicação mais aceita para este fenômeno é que os canídeos antigos, antepassados de nossos cães, eram caçadores noturnos e a diferenciação dos tons de cinza era muito mais importante que a visão das cores.

E como todos os predadores, os cães identificam rapidamente objetos em movimento. Isso era fundamental para seu bom desempenho na caça. Ainda hoje existem numerosas raças que “caçam com a visão”, como os galgos, whippets e quase todos os lebréis. Este é um fator dos mais desenvolvidos na visão canina, podendo, em campo aberto, distinguir objetos do tamanho de um gato em movimento a quase 1.000 m. Por outro lado podem demorar a enxergar um objeto parado que você tenta mostrar a 1 metro de distância.

Por isso é mais fácil chamar a atenção de seu amigo com movimentos e sinais.

Portanto podemos afirmar que os cães não enxergam melhor ou pior que nós, apenas o fazem de uma forma diferente.

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