Xander has a fur ball which he can't seem to get up. He's been sick a couple of times over the last week.Then last night he was trying to be sick at about 8 then twice more in the night. Seems a lot to me, should I be thinking of a vets visit? He is fine in himself and has been running around with his sister this morning. He has grass and a malt paste although I offer it him everyday he only occasional eats it. Any suggestions gratefully received?