Labrador Retrievers

my boxer conceived 16th of december.she has milk already. she bled 3 wks ago, but just a little. but now her nipples seems like going back to normal size and she still is not big.so i got curious and carefully squirt some of her milk because of my concerns. well a little bit of milk came out, but it's mixed with blood. i tried another nipple, and it's all just blood. what could this be? our vet office is not open on weekends. we live in a small town.

She may have a slight infection in her nipples/mammary glands. This is called Mastitis. The best thing you can do is hot compress her nipples 4 times a day for 10 minutes and clean them with an antibacterial moisturizing soap 3 times a day.

For the hot compress take a wash cloth, get it wet and ring it out so its barely damp. Put it in the microwave for about 20 seconds and check that its not too hot for your skin. Place it on her nipples and apply firm even pressure and hold on for as long as it stays warm. You can use bigger hand towels for this as well. When the towel is no longer hot, rinse it out, ring it out and microwave again. repeat this so that you're compressing the areas for a total of 10 minutes.

The purpose of hot compressing is to increase bloodflow to the area which helps carry the infection away. Don't squeeze at her nipples, just keep them clean and do the hot compressing.

If she should develop any other symptoms such as lethargy, vomiting, diarrhea, or if the discharge becomes purulent (pus), then I think you should take her to a vet as soon as possible.