Guiness update

I took Guiness to the vet Monday for lab work.  It all came back normal.  So today I took him back again to talk to them about him not wanting to walk.  Its kinda weird.  He will walk out in front for a while but then he starts to lag behind.  So Miley will be walking 6 feet in front of me and Guiness will be 6 feet behind.  Then sometimes he just refuses to walk at all.   Last night he was doing really well and I thought maybe I should cancel the appointment but before we finished he started lagging behind.  Then he refused to walk at all and  my husband had to carry him part of the time.   So back to the vet today.  They drew blood for thyroid (thats my guess what is wrong with him) and they drew blood for cardiac enzymes.  Apparently shelites are prone to  having heart valve prolapse.  But usually they get a heart mumer, he didnt have a heart mumer.  But the drew the cardiac enzymes to rule out heart disease.   The other thing it could be is pain.  So they gave me pain medication that we started tonight and see if that makes any difference.  So will see what happens.