I have two female puppies, both about 8 months old. A friend of mine owns their sister. There would've been no problem, but my friend has now purchased a male dog, same breed as my puppies, and half the age. I need to know how to tell my dogs are on heat, so as to avoid them getting pregnant. My friend's ***** is spayed, but her other dog is not, and neither are my puppies. So, what is the easiest, and most reliable way to tell they are on heat, or about to go on heat?
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