Drifts to side...lame??

I've noticed for a while that when Tash runs/trots she tends to "leg yeild", she goes forward but yet to the side. She drifts to both the left and right :huh: Does this mean anything...good...bad?

I took her out today to finish taking out the can garbage and see if she had to go pooty and I noticed she seems a little lame on the back right? Maybe it's just me being a worrying mom and "trying" to see something idk. But I do think she is a bit lame. I'm taking it that, that isn't good. Can hip problems cause lameness??

I now probably wont be able to get her in for x-rays till the end of July It all depends on certain things and how things work out. Hopefully I can get her in before that though