Dogs may feel cold after their hair is cut short, depending on a number of factors, including:

Dog breeds: Different breeds of dogs have different tolerances to cold.

Ambient temperature: If the ambient temperature is low, your dog may feel cold.

Individual differences: Each dog has different physical constitution and cold tolerance.

The length and density of the remaining hair: The length and density of the hair after cutting will affect the thermal insulation effect.

Health: Sick or weakened dogs may feel cold more easily.