Animal lovers (or not), please help me.

My brother's dog hasn't eaten anything since last Friday. He went from 100 to 0 overnight. My brother tries to feed him [i]anything[/i] he might want. He tried to give him his anti-fungal meds that he's been taking for months. The dog clenches his jaws so tight that my brother couldn't give him the medicine. He goes outside now and lies there. He normally stays inside unless he has to go to the bathroom. Now he goes outside and lies there. He won't eat and keeps his jaws so tight you'd think he has rabies. Although, he's not wanting to eat vs the fear of water.


I want my brother to be happy, and I want his dog happy.

He's 11 yrs old. But, something happened Friday. Because, he went from fine to acting like he's dying.


Is there anyway you can help me out here?