
Hi
My Springer Jasper was on Rimadyl, he was on them for quite some time, maybe as much as a couple of years for his mobility, i lost him bless him at 15, the vet did have to increase the dose towards the end as his mobility was poor, but the tablets as well as glucosamine seemed to help.
I wish you luck with Fred and hope that they do help. maybe its like when we have pain constantly and we take painkillers over a period of time and they build up in your system, and it helps, but as soon as you stop the meds gradually come out of your system and the problem comes back. i know Jasper was on them daily.i hope this is a little help to you.
good luck Marie