Hi Min
Min think it could be stiffness when she stands after sleeping resting, these old bones of mine are the same until they loosen up
Well Ollie started off on Yumove 2 a day and then after about month went down to one and he stayed on them for several years, about 18 months back I went to Yumove Plus or senior and one a day, which he still has. The use of them was down to his mobility and eagerness to still maintain his show pony jumping skills not quite reaching the heights he still expected to achieve
Up until his illness in Jan last year I swear they kept his senior years on hold somewhat.
Vet insisted he remain on them when he started on water tabs and steroids - by now after over 14 he is struggling but with his illness and his age still managing his walks and with the aid of a low wide sofa stool he still makes the bed
I mean our bed not his.
As for your question I understand it is 4 to 6 weeks on 2 so yes you could give 2 for another couple of weeks.
Another thing is you can always ring the company the ladies are fantastic and very up on the products. Plus if you subscribe they give 30% discount and you are not tied in. Also if you this you can text chat to Pawsquad vets for advice free.