He woke up this morning normal, he didn't seem to be suffering from anything . In the evening, he was somehow silent & kept on closing his eyes. A few days ago, i noticed that he's having difficulty in eating and drinking. This evening, he had his meal normally,but there was a lot of saliva within his throat even though he's breathing normally. Right now he's asleep, i've tried to wake him up several times , he lifts his head a little with eyes closed ... I'm really worried and i have no idea what's wrong with him ?????