My son lived through an enlarged heart because of a hole (size 5 VSD) in his heart and all that. I wouldn't let them do open heart surgery. Now they can't find the hole anyway 🙏. It healed. Faith, good food and fun is the best medicine.🤗Hopefully Cathie - she really is a happy dog. Completely different to Fudge who they lost just over a year ago. While Fudge just liked to follow scents and would only paddle in water, Tilly loves swimming and toys and chasing a ball. The vet said to carry on as normal with her and let her be as active as she wants, but now they know she is a ticking time bomb it is a worry for them.