Good Morning and welcome! I am Dr. Loretta, a licensed veterinarian and I am happy to answer your question.
THese signs can be typical for arthritis or a partial rupture of the ACL if this is the hind leg. IN either case, this lameness will come and go, een with the Meloxicam on board. If this is a hind leg, have your vet xray looking for severe arthritis and perform a test called a "drawer sign". If Bella is positive for the drawer sign, this means that the ACL has a partial rupture and nothing except surgery will resolve this.
If the lameness is in the front, your vet can xray for arthritis or possibly an unstable disc in Bella's neck or back that can cause this.
At any rate, without further diagnostics, you will nt know for sure what will help Bella past this. The Meloxicam will decrease pain but will nto give a long term solution.
Does that make sense to you?
Please let me know if you have ANY other questions. My goal is to give you 100% satisfaction and if you are not yet satisfied, please REPLY so I can clarify for you.
Sincerely, ***** *****