Video is always helpful, but understandably difficult to obtain.
… So I wrote my response below the horizontal line, but once I finished, I reread your entry more and realize I was imagining it wrong, and I’m pretty sure that’s what Wick does sometimes when he eats his cecotropes. It’s normal. Wick doesn’t open his mouth, but he 100% openly chews the air before going down to the hole, making it very obvious when he’s going to eat one. The butt thrust up is just a readjustment to get the right angle. For Wick, I think he outgrew his usual angle of approach down under, so he has to adjust nowadays.
Now below is the scary kind of reply, which may still have some interesting information for you to know, but I think what you’ve described is parallel of Wick, who’s does this regularly and is definitely healthy.
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My only thought is an obstruction or something odd happening in his cecum. This is where the GI sends nutrients it wants to ferment and moisturize before it exits through the bottom-hole, to be eaten. Perhaps there’s something in the way which is requiring him to make some movements to shimmy it through.
This is just an educated guess based on cursory research. Some terms you can look up include:
1. Cecum – branch in the GI where nutrients go to be formed into cecotropes.
2. Cecotrophy – act of eating it
3. Cecal motility disorders – ailments dealing with malfunctions in cecum production
… On one hand, if this isn’t a problem with the cecum, diving into this research could cause unnecessary panic, but, I think it may be worth reading up and seeing if you can find anything which may align with what you’ve described. I think most times, cecotrope-related problems revolve around diet, but I haven’t come across experiences of issues in the anatomy itself.
The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.