hi everyone, i have a 15 yr old border collie named lady.she has always been in good health.about a month ago she was running out to see the horses and just fell over.she turned blue but did not make any seizure movements.i ran over to her and she got up,shook it off and was normal again. this afternoon,same thing.we were going to feed the horses and i saw her go down by the fence.just fell over.this time she was blue with seizure movement.i couldn't get her up.i had to pick her up and put her on the wagon and pulled her back to the house.she is eating and drinking if i sit her up but she will not move her legs.she moves her head and makes facial expressions and will sit up sternal .if i pick her up ,she puts pressure on her front legs but will not move them.she does have feeling in them when i pinched all 4 legs. i do have some prednisone here and that is all i can think to do right now.any of you ever had this happen? does this sound like a stroke or heart attack? we have a mobile vet and i am calling her in the morning but just wanted some other thoughts before the vet.i know she will say she is 15 and it maybe time. here she is 1 week ago.she loves to ride. thanks for any help.