Thanks for the responses! Since we will be home all weekend (we were supposed to go to Tahoe but Bruce is sick) I'll be able to keep an eye on Jax. I will try to look in his ears and see if I can see anything. Other than that he seems to be acting just fine. Bugging Paizly as usual.
I hope a vet visit isn't needed. I just spent close to $300 on xrays for Zoee's leg. Sigh...But whatever needs to be done will be done.