5 year old intact bullmastiff.
A couple of months ago we noticed shaking in his back leg. Usually the right but sometimes the left. Only one at a time, only ever when standing and if he stepped or shifted weight it would stop. Maybe 1-2 times per day for less then a minute. It didn’t seem to correspond to exercise or anything.
Brought him to the vet for an exam. Nothing conclusive but vet thought possibly a partial ccl tear. Put him on a 3 day trial of anti inflammatories to see if it responded. There was no difference.
Journaled for a couple of days with his regular routine and the only notable connection was that it occurred most if he was excited. Exercise didn’t seem to be a factor. When he went to the vet, saw other dogs besides the ones he lives with, or friends came over he would shake more.
Decided to try rest. Spent 2 weeks with no stairs or jumping on/ off anything and only very short leash walks. No change.
Worked in longer walks over the following week, no change.
Brought in for x rays. He was sedated and 2 vets tested for drawer sign which was negative. X rays showed no spine or hip issues but moderate inflammation in both knees. X rays were sent to radiologist who did not observe sign of ACL tear.
He seems perfectly happy. No limping, no hesitation in walking. Eating and drinking normal. Just intermittent shaking.
I think the most confusing part is how it is provoked by excitement.
The vet is going to refer him to an orthopaedic specialist for consult.
But I thought it was also worth posting here to see if you have any other ideas.