My Border Collie is just over 9 years old and has over the past couple of days started to walk into a lot of things. I have checked her eyes and they are cloudy and react very slowly to light change, also the whites of her eyes are very bloodshot. Is there a possibility that she has gone blind or could it just be an infection? It just seems a bit bizzare as it seems to have come on just in the past two or three days and it has been very hot. Could it be connected to the heat? Any help or advice would be much appreciated.