Hi For 2 years now my grass was like a bowling green, well nearly! Since then it’s went really really patchy and some of it even died. We have had 2 dogs 1 female and 1 male for 20 years and it’s not urine marks, actually if you dig under a patch there is no soil, it just looks like sand? We have a lot of fruit trees, conifers which I think may be the problem? I’ve tried patching it with many many products over the 2 years and am reluctant to put turf down until I find out what the real problem is. Can anyone advise at all?