When I got my mare back in Feb she was in foal and due in March. Some time in March I noticed her a little weak in her backend. Like she was going to fall. I thought that it was from the foal getting redy to be born. The baby was born healthy April 1st. She was weak a few day after but seamed to be ok. Now a few days ago she looked weak again even triped and fell when asked to trot. I called the farrier as her feet did need to be trimed. She is still weak if I push her hind end even a little she looks like she could fall. I am worried and don't know what to do I called the vet and we gave her a shot of banamine in hopes it will clear up.