What is Mastitis in dogs?

Bleeding or inflamed teats on a male or female dog sounds like mastitis. You'd think this problem would be confined to females but it's not. Mastisis is a bacterial infection of the breasts. Typically, the dog's behavior will not be effected until the infection becomes severe. You can try to massage with a warm/hot compress, being careful not to burn the dog, and you can administer antibiotics -- wide spectrum unless you know which bacterium caused this problem (Staph and Strep are common offenders). The best answer of course is to let the vet handle this. Typically they'll culture the bacteria and select a treatment with far more accuracy than you can do at home.