Causes of red nipples in dogs

The main causes of red nipples in dogs are local stimulation, hormonal secretion changes, mother dog lactation, mammary gland tumors, etc. Local irritation is mainly caused by trauma, skin diseases and allergies can cause local inflammation and redness. Changes in sex hormone secretion. If a female dog is not spayed, increased sex hormone secretion during pregnancy may cause red nipples. Lactating bitches may experience localised redness due to localised irritation from puppies and hormonal problems. Mammary tumours can cause the skin of the udder to become ulcerated or infected and the nipples may be swollen and red with pus draining from them.