
If it were me, I'd probably want an echo done just to see exactly what's going on (as x-ray can't show you movement or heart beats etc) but that won't cost £400 - Paige is booked in for hers (she was equivocal for DCM 2 years ago so we need an update) next month and it's going to cost me around £80. Her heart isn't covered either so I sympathise with the cost worries. She's not going to a specialist though, just my normal vet whose speciality is cardiology, if that makes sense.
It *might* be worth having a holter test done but tbh I probably wouldn't - Soli had several and all were fine but she still suffered sudden death, only weeks after the last one so I don't put too much stock in them really.
I get the life expectancy argument but at the same time, without DCM Soli would have gone on for years - she was fighting fit in every other way and lived well beyond everyone's expectations, I never treated her as anything other than a young dobe. Same with Paige who is now 8, she's every inch a youngster!