Willows waddling

[LancashireLass]

Hi everyone, I have noticed this past couple of days Willow my Syrian has developed a waddle and is not quite as agile with her back legs. At this present time I'm thinking age has a lot to do with it, she will be two years old next month. She is normal in her day to day activities, eating and drinking etc, also, despite with waddling of her back legs she gets about extremely well, she loves her runs around the front room, she does sleep a lot but that's to be expected with her age. But before I put her through some unnecessary stress by taking her to the vets to get checked out, I just wanted some perspective on it, could it be just her age or something more sinister?

J xxxxxx