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Hi, and welcome to JustAnswer. I'm sorry it has taken some time for a veterinarian to reply to you. I'm Dr. Barbara, and will be happy to help you with your Chow Chow this morning. I'm currently in Taipei, so in a similar time zone.
Hot spots can be the result of several different problems: Fleas, food allergies, inhaled allergens, hormonal imbalances, and primary skin diseases like mite infestations or fungal infections.
I'm unfamiliar with Deltacal, so will take a few minutes to look that up.
Hello again. I can only find Deltacal as a calcium supplement. For what condition in the leg are you using this for treatment? It is also possible that pain somewhere can lead to chronic licking and then hot spots>