I work at a pet hotel and always feel a little sick, what could this be from?

Always sick: Depends. You may feel sick from work, or you may be sick from other causes. Best to see your physician to be examined to determine the cause of your sickness.

Too vague: What do you mean by a little sick? Nausea ? headache? running nose? sneezing? tired? Achy? We would need to have more information about symptoms before we could venture a guess.