This is what just has been happening with mine...I took a closer look and she had red mited crawling all over her...they apparently are in her ears and causing the limping/unsteadiness! She needs attention right away if it is mites...I only noticed the mites because i was looking at her face real close and noticed all these red mites crawling around her eyes! Mine is very weak and getting weaker ...I treated her with poutry dust and vitamin water in hopes she will recover...tomorrow she will get a bath in flea and tick puppy shampoo and another dusting...