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Thank you for your question. My name is***** I have been a small animal veterinarian for 13 years and I'd like to help with your quesiton.
That certainly doesn't sound like a reverse sneeze. Is it possible that she could have something stuck in her throat? I have seen that same gulping motion in a dog with a bone suck behind his rear molars.... it was sitting crosswise in such a way that he could still breath and drink, but it was making him feel like there was something in the back of his throat so he kept swallowing.
I would really recommend having him looked at by a veterinarian ASAP. If he continues to do this he could swallow too much air. When their stomach fills with air they can develop a very serious condition called bloat.
I hope that helps, but if you have more questions please let me know.
That kind of movement I would associate with swelling or foreign material in the throat or esophagus. You would need to sedate and scope the area to know more.