Liz Buchanan BVSc MRCVS
Keymaster
Hello and thankyou for this interesting question. I think that it would help to see this behaviour; perhaps you could try to capture it on video for your vet. Things that I thought of however, include dental disease, sinus disease, oral pain ir temperomandibar pain or even fitting / neurological symptoms ( which can certainly occur in the absence of other signs). Therefore, this is a sign that ought to be taken seriously, even if it appears to be trivial or short lived. Please do talk to your vet.
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