Rather than being concerned about applying something to the healing site, perhaps you'd have better success with an Elizabethan collar. These can help to keep a dog from licking or chewing at just about any spot on their body, if properly applied. Also, you should have your veterinarian take a look at the healing incision to be sure it is healing properly.
A collar will stop her from licking but it doesn't stop the itch, kinda sounds likes torture to me...imagine if you had an itch and your hands were tied behind your back. The incision is healing great, I just want to relieve her discomfort.
I didn't mean to sound insensitive to your dog's urge to itch or chew at her incision. Most dogs really do adapt nicely to the Elizabethan collar concept.
However, your question about a topical product is a valid one. During the early stages of healing of an incision, it's not a good idea to put anything on it that might deter healing. If this is several days post-op and the incision doesn't look too inflamed, you might be able to try some of the products that reduce skin inflammation and itching, such as Solarcaine or any of the numbing agents that end with the letters..."caine"....
Only use a small amount at first to be sure that it doesn't further add to the irritation.
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