My 11mo old female jack russell has been yelping in pain at times. I have felt all over her body without a reaction. She's really tired and she can't get up on the furniture on her own. She's using the bathroom fine and it seems to be normal. I thought at first maybe she had pulled a muscle playing so I gave her some children's advil. (I don't know if that'd hurt her or not but she's been so sick and i was desperate.) It actually works when i give it to her. She starts to eat and drink and play soon after. After it wears off though she gets really bad again. Could it maybe be a virus or something? She hasn't had diharea or vomiting. She seems to be having body aches. I've also pressed lightly on her stomah and it doesnt seem to bother her. Its the weekend so I can't take her to the vet just yet. Any suggestions as to what it may be??