This may seem like a strange question but my two cavs who are both 2 years old pant excessively. We have two other dogs who can be lying peacefully in the same room meanwhile my two cavs are lying panting like crazy. This happens when its not hot in the room, they don't seem to need a drink and when they are not being active ie.just lying still!!! In other words there doesn't seem to be any logical reason for this constant panting!!! Is this a breed specific thing? Can anyone make any comment re this?