My 9 year old dachshund has been exhibiting some odd behavior. He is shivers slightly and acts very lethargic. He has no energy to do anything, doesn't want to go on walks or even get out of bed. All of his blood work from the vet came back normal and all of his organs are fine. He also had x-rays on his lower back and it was fine too. He has also acquired an odd snort that he does when he's lying down, but this might just be allergies. Thanks for any help!!!