I'm not sure but how old is your dog and what breed is he.  Sometimes with age and certain breeds are prone to problems with their hind end.  Please go to the vet it can be something that can be treated very easily and that would improve the quality for your dog and for you.

I have a 9 year old Shih-Tzu (Bailey) that we dearly love.  One thing that you should know is that sometimes your shih-tzu might have what looks like an attack where he can't breathe.  You will be scared to death.  This is called a reverse sneeze.  If this happens REMEMBER to simply put your finger over his nostrils and … Read more

You could be describing a reverse sneeze if so simply place a finger over her nostrils if it is a reverse sneeze it will stop immediately.  However she could be having a seizure so she really needs to be seen by a vet.