Dogs can lose blood from accidents in traffic, but also from cuts, gunshots or bites. If there is an increased bleeding tendency due to a coagulation disorder, it can also lead to spontaneous bleeding, for example from the nose.
External bleeding is usually noticed immediately, internal bleeding only becomes apparent later, usually through paleness, apathy, possibly also signs of circulatory shock (cold legs, racing pulse, delayed filling after pressure on the gums). A coagulation disorder can be determined by a blood test.
Minor bleeding will usually stop on its own. Pulsating arterial bleeding (pulsating, bright red blood) is dangerous and should be temporarily stopped with a pressure bandage while the dog is being taken to the vet. If necessary, a clean handkerchief or handkerchief can be pressed onto the wound or an affected leg can be tied off during transport.
To avoid accidents, especially if you have an increased tendency to bleed, you should consciously avoid dangerous situations and keep the dog on a leash.