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How long is the estrus in dogs and what are its phases?

April 26, 2017estrus phases

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How long is the estrus in dogs and what are its phases?

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A. Dogs: about 3 weeks. a) 1st 7-10 days – clear, red discharge. b) Discharge then turns clear yellow for several days – Dogs most fertile at this time! *These are average – many bitches will vary markedly in timing of heat period phases.