The general concept 'horse' can apply to many horses and is universal. Pointing to an animal and saying 'this horse' singles out one definite animal.
'Horse': a general meaning admitting multiple instances.
'This horse': one horse specified in the present context.
The demonstrative narrows the reference to an individual, and that specification depends on the context of pointing.
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Demonstration singles out this horse
Universal and Particular — Definitions and Practical Classification
The general concept 'horse' can apply to many horses and is universal. Pointing to an animal and saying 'this horse' singles out one definite animal.
'Horse': a general meaning admitting multiple instances.
'This horse': one horse specified in the present context.
The demonstrative narrows the reference to an individual, and that specification depends on the context of pointing.