Many times after heat a dog who has not been bred can get "Pyometra". This can cause many problemIt could be a Pyometra, false pregnancy, and seems like she may have an infection in her breasts. I would recommend getting her into a vet ASAP! She most likely needs to be spayed and for sure placed on antibiotics to stop the bacteria/infection.
Mastitis is a bacterial infection of the mammary glands, almost exclusively seen in females. It may occur in one or multiple glands and usually occurs in lactating animals. It is a fairly uncommon condition, but occurs more frequently in es (female dogs) than in queens (female cats).
Mastitis is most commonly caused by an ascending infection from the teat opening. Other potential causes or contributing factors include trauma (from nursing puppies) and hematogenous spread (spread via the blood). Mastitis can be a painful condition that usually is fairly localized, although some animals may become systemically ill or even septic (bacterial infection in the blood).
Canine Mammary Tumors: Mammary tumors in dogs are most frequent in intact es; they are extremely rare in male dogs. Ovariectomy before the first estrus reduces the risk of mammary neoplasia to 0.5% of the risk in intact es; ovariectomy after one estrus reduces the risk to 8% of that in intact es. Es neutered after maturity have the same risk as intact es. The two posterior mammary glands are involved more often than the three anterior glands. Grossly, the tumors appear as single or multiple nodules (1-25 cm) in one or more glands. The cut surface is usually lobulated, grey-tan, and firm, often with fluid-filled cysts. Mixed mammary tumors may contain grossly recognizable bone or cartilage on the cut surface.
More than 50% of canine mammary tumors are benign mixed tumors; a smaller portion is malignant mixed tumors. In the latter, epithelial or mesenchymal components, either singly or in combination, may produce metastases. Histologically, canine mammary gland tumors have been classified by the World Health Organization as carcinomas (with six types and additional subtypes), sarcomas (with four types), carcinosarcomas (mixed mammary tumors), or benign adenomas. This classification scheme is based on the extent of the tumor, involvement of lymph nodes, and presence of metastati
Spaying her is the only way to help reduce ovarian, mamary, cervical, and a host of other reproductive cancers. Not to mention you will have a better pet that is happier and lives longer!
See
http://www.drna.org/ for any andf all questions on Dachshunds.
Another site for health issues is
www.veterinarypartner.com