Theresa, you are very brave and it's so good of you to be taking Max to the cardiologist tomorrow. I'm sure you've fallen for him big-time too, and I admire you looking at the overall picture.
If he does go up for re-homing through Many Tears, knowing what you and the rescue know about his health and the cost and care implications, I would say it's guaranteed that he will only get the very best home, who appreciate exactly what they're getting into. I'd have him in an instant if I didn't have 6 already and had the money to pay for the meds, which are likely to top £100 a month in time.
Poor, poor dog. . Often people only thinking about the poor ex-breeding bitches, but those puppy farm stud dogs have suffered so much too. The cold, the wet, the boredom. I've been told many times not to reflect on Bradley's past (he's a M/T puppy farm stud dog rescue too), but I can't fail to acknowledge and break my heart over his previous life. He is such an intelligent cavalier - what a waste of most of his life.
We were lucky with Brad. We suspect he's older than the 4-5 years we were told he was at the time, but he didn't have a murmur, so we insured him straight away. 18 months on, he does have a murmur, so we made a wise choice.
Good luck in whatever you decide to do.
One of my boys is 7 and has had a 5-6 murmur for the past 20 months. He is better in the winter than the summer and we know he's on borrowed time, but he's still here . He gets walks when conditions and his health allow - but it's a matter of gauging the weather, how much he's coughing, how energetic he's feeling etc. He's not allowed to go anywhere in the summer - vets' orders. Having said that he is the happiest dog in the world, so that's all that matters.
Proud member of The Spaniel Trust - putting the trust back into spaniels.
A Charity registered in Scotland SC038987