@allan : Hey allan , well dogs are also like human beings, they too have mood swings , theres not a hard and fast rule that they should be active every single second of the day and ready to please you. and as you have checked all the things like mr dinkar told u about, don worry man..if u want u get a vet check and calm yourself. Just be sure to give your lab nice quality food, enf of luv n affection , limitied exercise and out door activity and deworm him/her on time. if these things are taken care of ...u will harldy need any vet except than actuall medical reasons.. So chillax don worry enjoy ur fren...Regards , Siddhaant Trivedi . Owner of Dvijatmankennel.