My dog's neck is bleeding. What can I safely put on it to stop it?

I don't recommend it. Although quite safe on superficial wounds, dogs lick and ingest most of the topical ointment you apply and therefore should be used only under direct veterinary supervision and if there are no other appropriate options. Many human ointments contain multiple other ingredients which are not necessarily safe to be swallowed.

I would recommend that you have Vicky evaluated by the vet. If he is so painful that he is becoming aggressive, then it is unlikely that ointment will heal it effectively. He probably needs pain medications and oral antibiotics. He should also have the hair clipped away from the wound to prevent additional infection. If he is scratching the wound, then he may need to wear an e-collar/cone to prevent further damage. If the wound is located in an area where the e-collar will rub, you may have to get a little more creative in how you prevent him from scratching, such as using a soft, donut-style cone or bandaging the feet.

If you think the lesion was caused by the collar rubbing, you can put some neosporin on it. The most important thing is to keep her from scratching. You may have to put a t-shirt or similar around her neck , so she cannot directly scratch the lesion. If the itching does not stop within 2 days or if the lesion starts to expand or ooze, you will need to stop the neosporin and take her to a veterinarian for an exam, as it may have been infected by bacteria. This could also be a fungus, in which case the neosporin will not work, If possible, wash her collar before putting it back on

Applying a triple antibiotic on the wound and a turtle neck shirt bandage ( just like it sounds...a turtle neck shirt and covering the area so he cannot scratch it) can be helpful. Depending on the severity of the wound it may also need oral antibiotics so I always urge people to have these seen. Hope this help you!

Place an e-collar (cone) on him to prevent further trauma. Have him examined by your veterinarian to diagnose infection or injury. Yoda may need both antibiotics and medication for pain or inflammation. If you can't take him just yet, clean the area with diluted betadine or chlorhexidine and place an e-collar on him. You can buy them in most pet stores. Monitor for resolution, but if gets worse or if he becomes lethargic or stops eating, get him to your vet.

Poor Lucky! I'm glad to hear that his vet will be checking him out tomorrow. From the picture, the skin lesion looks most like a hot spot (aka acute moist dermatitis). If you have clippers on hand, you can try to carefully trip the hair over and around this skin lesion to allow for better air flow. You can also gently clean his skin with an antiseptic solution, such as diluted chlorhexidine or diluted betadine, but be sure to rinse and dry thoroughly. If Lucky is scratching at his neck, it would be best to put an e-collar (cone) on until his appointment. The vet may need to prescribe antibiotics, steroids, or topical sprays to help this lesion to heal. I hope this helps and that all goes well!

If you can rest her and keep the area clean, then the neosporin is a good option to see if it will scab over or dry up. If it continues to bleed or gets larger then you have to make a visit to the vet.