[anonymous]

Any changes in appetite? Behavior?
If not, I go by a 72 hour rule, if it get’s worse, or continues, go to the vet.

If you have a good relationship with your vet, leave a message for the vet to call you back when he has a minute. As a senior dog, it could be anything, impossible for anyone over the intrernet to diagnose.

PS: Panting usually indicates pain and/or anxiety.