My 3 year old Tarrier Mix bites at the air for no reason, or I think its no reason. He has eplisy but takes meds everyday and I don't know if he's having small episoides or if he has OCD or its cause he's has anixty. Any information would be great. Thanks

My dog used to do it for flying bugs.

It could be a number of things unfortunately.
It could be a neurological disorder linked to the epilepsy or he could simply be trying to catch flies like KISS said.
Only your vet knows for sure sorry.

I agree with the above.

My lab did this too, a few years back. It ended up being an inner ear infection.

Time to go to the vet, make sure it's not something serious.

Thanks Everyone