my jack russell 8th month old has been really lazy the past two days. She is still alert but is just tired lately. She was spayed about a month ago and was fine right after. She just all of the sudden is really tired, and we haven't done all that much. If you have any suggests why she may be tired or lazy please tell me why because we have no clue. OH and she sometimes shakes when she is asleep. we don't know why she does that either.