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give your mother a nipple lick
If her nipples are getting bigger then chances are she's on heat.
Take it to the Vet immediately. This could be cancer, and infection or tumor.
It is time you pay a visit to the vet. This symptom is better to be checked as soon as you see it.
Get them re-pierced. Or wait till your breasts are unswollen
You will grow small lumps under your nipple and it will be swollen for about a year. This usually happens when your voice is changing.
She needs to be taken to your Veterinarian to be checked. In the mean time, try to put something on that nipple that will keep the pups from getting to it until you can get her in to see the Vet. She probably has mastitis and needs treatment. You need to get her into your Vet SOON so that this infection does not spread to all of her breasts.
it just hurts for simply no reason at all unless you are pregnant
There is not enough information here to help you. What breed dog? Age? Sex? when did this start happening? Is the nipple on the same side as the leg? Is the swelling under the teet itself or in the general area? Is it sore or warm to the touch?
A nipple is a nipple, simple as that. The sometimes darker // pinker skin around the nipple is called the aureole.
Well if the mare is pregnant it means she is getting very close to foaling, especially if they are dripping milk/colostrum. If however the mare is swollen without being pregnant it can mean she has an infection and might need a course of antibiotics to clear it up and make her more comfortable.
if it's just a bump the size of a nipple then it's normal. A dog's penis is flat tipped with a bump. And the base of his penis will probably become large and swollen when he has an erection, which is also normal. But you probably knew all of that anyway so whatever