It could be that the dog is dehydrated. Urine shouldn't be neon yellow. However, it shouldn't be clear either, since that indicates an intake of too much water.
It could be that the dog isn't getting enough water. Dehydration causes this. Could also be a bladder infection but much more likely the first of the 2.
Dogs are just like people. The more they drink the lighter their pee, the less they drink the darker their pee. I would suggest purchasing a "Never Ending Water Bowl"