Cory is in heat (and hopefully nearing the end of her cycle). This is our first experience with a dog in heat. Our previous females were all spayed. We think she went into heat around Sept 20, so I guess we have a week or two to go. (We aren't positive because she only spotted for one week. She is still swollen.) My strange question is: Can being in heat make their breath smell really bad - like cheap oil packed tuna with metallic undertones? Sometimes I can smell iron and I know that is from her being in heat. But the awful tuna breath - PLEASE tell me it is due to her being in heat.