Since I had her Maisie's breathing has always seemed laboured to me, and of course when I got her I had her checked out - no crackling or other noises, no other symptoms. After listening to her heart again today and looking her over, we discussed it and the vet has suggested a scan of her heart and lungs as she suspects a condition called pericardial effusion. Apparently this is where the gap between the fibrous lining that surrounds the heart and the heart itself can fill with liquid, meaning that the heart can no longer expand and contract as much as it needs to in order to pump the blood around the body. We both noticed that Maisie's feet were looking quite purple today and this could be the reason why - as her blood isn't being oxygenated enough. Poor little piggy. She's booked in for the scan on Monday. If the scan shows this is the case, the fluid can be drained, providing there is enough of it. This will require a heavy sedation though - not quite as much as a GA, but a significant amount. If there is only a little fluid, we can go down the route of medications to help disperse it, in order to prevent any oedema.