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Full Idea
A dog certainly makes similar kinds of judgement to your perceiving men by their hats and cloaks when they see their master's hat or clothes, …and they can recognise their master even if he is standing, sitting, lying down, or crouching.
Gist of Idea
Dogs can make the same judgements as us about variable things
Source
comment on René Descartes (Meditations [1641], §2.32) by Pierre Gassendi - Objections to 'Meditations' (Fifth) 272
Book Ref
Descartes,René: 'Meditations on First Philosophy etc.', ed/tr. Cottingham,John [CUP 1986], p.77
Related Idea
Idea 3615 Little reason is needed to speak, so animals have no reason at all [Descartes]