To better help you:
How old is he?
Does he have any other symptoms (loss of appetite, loose stools, lethargic behavior)?
Thanks for the additional information...if we could ask them it would make life so much easier wouldn't it ? It's good that he is acting normally when not sleeping, however if you are noticing that he seems to have a change in his sleep patterns (excessive) then a vets visit will be in order. Some endocrine disorders/thyroid problems can cause symptoms like this as can parasites, infections and nutritional problems. The best way to pin point this is to have him seen. Fortunately, all of the above mentioned issues are treated relatively easily. If you need any other information, let me know. I hope he's doing better soon. -Robyn
No problem Any time that a change in behavior is seen, it's good to get in touch with your vet and let them know. If this is an infection or parastie issue, you'll want to treat it sooner then later. Additioanlly, blood sugar problems can result in hypoglycemia which can be dangerous. Consider giving your vet a call and letting them know what is going on. As they know your little ones history they'll be better able to let you know when an appointment should be made. I prefer to err on the side on caution and would see about having him seen. Shelties are a great breed and I hope yours is doing better soon. -Robyn
I hope he's feeling better soon! Consider giving the vet a call to fill them in on his condition. If he's having this kind of loss of energy, a vet visit will do him well. Keep us posted. -Robyn