Transient erythrocytosis (relative polycythemia.) The spleen uses splenic contractions to send large numbers of RBCs into a dog’s circulation in response to stress, anger, surprise, excitement or vigorous exercise. This increases the ratio of RBCs to plasma, and is a temporary condition.
This phenomenon can account for a dog’s gums going from pale during sleep and rest to pink or red in response to epinephrine. Once the stressful event is over the number of RBC in circulation returns to normal. This is an adaptive response for survival.
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