i took romeo away for the weekend. he is used to long car rides and ate his regular diet. he has not pooped in over 24hrs. i thought maybe from the excitement or the stress of not sleeping at home. he is a good traveler. he usually poops out a nice tootsie roll at least twice a day. his anal glands seem ok - no scooting. how long before it can be dangerous? i'm really nervous he is my first dog. should i bring him to the vet?