Stiff joints!

Since last Thursday evening, I've been having problems with my right back leg/hip.  Every time I get up, after having a little snooze, it's really stiff.  However, it only seems to happen in the evenings.  And I can still jump onto the sofa.

Anyway, Ann has decided to try me on these joint tablets because obviously she doesn't want me to be in pain.  I started them on Saturday and so far we haven't noticed any difference.

I'm not showing any signs of stiffness in the mornings though I must admit I'm always a bit snail like on my morning walk.

Any thoughts peeps?  Or do you think Ann should take me to the vets for an MOT?