Indeed, as his family we will prioritize his quality of life and that he does not have pain. He is always happy and pampered and I have already discussed this with my human children about this new stage in the life of our piggie. Perhaps by improving his breathing he can feel more comfortable and with the treatment we will achieve a balance. If that doesn't happen, nature will take its course. The important thing is that he is happy and accompanied as always. With his vet we have investigated a lot the guinea linx, he did not know it. It will surely also serve for the management of other local guinea pigs. Apparently heart problems are not so strange in this type of animals. I will always be grateful to you. It first it has been hard but it is part of life itself.
You are of course always welcome to come here!
Guinea Lynx is a USA based forum that specialises on the medical side of things whereas we concentrate on practical and emotional support for the care at home as well as on all the other aspects of ownership helping our members from all over the world to realise as good a welfare standard and to understand their piggies as much as they can in their own often very different situations. We prefer the practical approach since welfare is an ongoing, constantly evolving process and not an absolute state of perfection. Any little improvement that an owner can make (and we all can always make at least some) is one step more in promoting and spreading welfare.
We have also built up one of the largest and widest ranging information resources on here (best accessed via the Guinea Pig Guides shortcut on the top bar) and we are the liveliest and one of the oldest still existing guinea pig forums the in English speaking world because of our friendly and supportive forum ethos and the collective experience of our members, several of which are long term owners or rescue fosterers.
Heart problems are not that rare although they can be very difficult to diagnose even by an experienced vet; like with any new area that is discovered there is initially a bit of an overreaction; we have seen that for instance when diabetes in guinea pigs came on the scene. It does happen but is not as common as initially thought when it was overdiagnosed.
For instance, none of the guinea pigs of mine that presented three symptoms for potential heart disease has responded to heart medication. In one case, I had to persuade the vet to give it a trial because he wasn't sure that heart problems in guinea pigs really existed!
But I have lost three guinea pigs in operations when their heart suddenly gave out; only one of them was found to have a heart problem (very irregular heartbeat) in the pre-op assessment, which turned a risky emergency operation into a high risk make-or-break operation - it sadly didn't come off. So I still haven't had my own heart piggy to gain practical experience with - not that I really want to! The problem is of course that some very different heart problems are lumped together but diagnostics are still lagging behind; especially as not everybody has good vet access or is wealthy enough to afford 'supervet' prices.
PS: We have other forum members with practical experience in looking after guinea pigs with heart disease.
Considering how far we have come in the nearly 50 years since the first guinea pig has come into my life, we can do so much more and know so much more today. But compared to other pet species, we are still lagging far behind. For every issue that can be treated, three new and even more complex problems turn up on the horizon...
But I am glad that you are realistic about the situation you are in and that you are doing all the right things! I always feel so sorry for owners who struggle to let go and then suffer terribly for not accepting and addressing their own fears in time. If you can manage it, it is always better when you can let go with sadness in your heart but without major regrets.