Yellowing Lawn

Over the past months I’ve noticed my lawn has been ‘yellowing off’ in patches. It is coming into summer up here, but the nice green tinge has been spoiled by my 8 month old German Shepherd Dog urinating in around the same spot day and night for a couple of months.
Not to be deterred I started watering the area fairly heavily to dilute the urine and bring my grass back, but to no avail.

After some research it was found that the high nitrogen content in dog urine causes grass to die off, just like applying too much fertiliser in one place.
Nice to know, but it still doesn’t solve the problem of ‘dog spots’.

My vet told me on her last checkup that a reduction in dry food, the bagged stuff like Pal Pedigree, Chum, Eukanuba etc, will reduce the nitrogen concentration thus reducing the damage to the lawn.
Two months later so far so good, I have noticed a reduction in the dead grass but there is a reluctance for new grass to grow where the yellow spots were.