母狗发情主人应该怎么做？

参考文献

[1]Llera.R,BSc,DVM&C.Yuill,DVM,MSc,CVH.Estrous Cycles in Dogs[EB/OL].vcahospitals.com

[2]Webmd Editoral.What To Know About Dogs in Heat[EB/OL].pets.webmd.com

[3]AKC Editoral. How Long Does a Dog Stay in Heat?[EB/OL].akc.org,Update:Jul 30,2015

[4]Bukowski.J.A,DVM,MPH,PhD&S.Aiello,DVM,ELS.Breeding and Reproduction of Dogs[EB/OL]. msdvetmanual.com,Update:Jul 2011