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To tell if a dog is in heat, watch for personality or appetite changes. They usually eat less, but sometimes they will be hungrier than normal. They may also have a bloody discharge
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One of the first signs a dog is in heat is excessive panting and whining. If you have a female dog her genital area will swell up and she will lick it constantly.
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There are several indicators that your dog is in heat, I have listed them here in order for your convenience. Change of personality (about one month before heat begins), swollen vulva
http://answers.ask.com/Science/Nature/how_can_you_...
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There are a variety of ways to tell if a female dog is in heat. Some specific ways to tell are if she is experiencing any of the following: change in mood, swelling of the vulva,
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