how long do dogs bleed in heat

Dogs typically bleed during their heat cycle for about 7 to 10 days, although some may bleed lightly and others more heavily. The entire heat cycle lasts around 2 to 4 weeks, with bleeding occurring mainly in the first half of the cycle (proestrus phase). Some dogs may have bleeding lasting from 6 to 11 days, but bleeding generally stops or significantly reduces as the dog moves into the estrus phase, when she is fertile and willing to mate. The length and amount of bleeding can vary by dog size and individual differences.