Last summer, my 10 lb. pomeranian (Ernie) was attacked by a racoon who bit his back leg, resulting in a very bad break.  We had to amputate the leg and Ernie has done very well until just recently.  We go for 2-3 mile walks almost every day and Ernie still loves to play and chase after toys.

About a week ago, he chased a squirrel and something happened to his remaining back leg.  In describing it to my vet, she said it sounded like his knee had gone out - something called "luxating patella."  He is nine years old and has never had any problems with his knees (patella) before.

Following the first episode, he seemed to recover within just a few minutes and was again walking very normally.  Over the course of the last week, it has happened 3-4 more times, most recently this evening.

Since he only has one back leg, I know it has to take much more strain. Has anyone else had this problem with their tripawd? 

Thanks!