We just rescued a 4 yr old tripod a month ago – he missing front right leg. We don't know if it was lost or if he was born that way. He was doing great and you couldn't tell he was missing a leg until the other night. He stared slidding when he was walking – like a stretch but doing it all the time. He can stand and still jump on the sofa and he doesn't seem to be in any pain. We asked the rescue and they told us that sometimes he did this sometimes when the weather was bad. The weather was bad yesterday but not today and he is still doing the same slide.  We were wondering if anyone else has experienced this moblity issue. 

Thanks so much for the quick reply .

Alittle more about Barnaby is he has been a  tripod for at least 2 of his 4 years – he was at the rescue for 2 years when we adpoted him. We don't know if he lost his leg or if it was from birth – there were no records from the kill shelter where he was rescued. 

He is a big dog, part boxer part hound and is about 75lbs.  We are controlling his diet and our vet said he is at an OK weight. We have carpet and no slip rugs on the hardwood floors and yes he is doing it on the carpet as well. Funny thing is that we noticed when he is outside and on the snow/concrete he doesn't seem to slip as much. He just started having this issue on Friday - until then he navigated w/o problems on the carpet.

We haven't done any therapy because he is not a new tripod.

I wanted to post an update on Barnaby. We took him to the vet and after a thorough exam she said that he was getting too much exercise…go figure. Because he was in a rescue he wasn't used to having a big yard to run in and he never went on walks she thought that he prob strained his front leg. She told us to rest him for 2 weeks and gave us an antiinflamatory. He is doing better.