Hi Lita, Neo does this every now and again, usually when the grass has just been cut and i actually wondered if dogs get hayfever!! I think what causes it with him is that he sniffs constantly at the grass when we are out and I think he gets grass in his nose and tends to sneeze for a day or so then is fine again. It only happens when the grass has just been cut so might not be the same as Max.

Hope he feels better soon.