Mix organic vinegar 50/50 with water and keep in a squeeze bottle, such as an old ketchup bottle for convenient use.
Apply vinegar rinse to your dog's coat, distribute evenly throughout his coat. The taste of the vinegar will prevent excessive licking and chewing as it acts as a taste deterrent. Vinegar will also address flea infestations if present, which may cause your dog to interfere with his coat and cause hair loss. Repeat every few days as needed to prevent your dog licking and chewing due to anxiety or habit.
Melt coconut oil between your hands and spread over your dog to moisturize his coat and treat fungus and bacteria present that are contributing to hair loss. You can put a sweater over your dog to prevent him licking it off and allow it longer contact with skin. If your dog does lick off coconut oil though, it won't hurt him. Repeat weekly
Cut a fresh lemon and place a slice in a cup of warm water and allow to sit for a few hours. Strain out lemon and any seeds and apply lemon water to your dog's skin, or spot treat where hair loss is occurring. Lemon juice counteracts bacteria that may cause hair loss. Use as needed locally.
Apply hydrocortisone sprays, available from a veterinarian, to spots where hair loss is occurring to prevent inflammation from allergies and other conditions that are causing hair loss.