My 4 year old boxer has had two episodes now where she is fine one minute; then, she goes into shock. Herr gums, eyes, etc. become very pale. Her breathing is labored. She goes limp. Her blood pressure becomes very, very low. We rush her to the vet and they give her a shot of Epinephrine - this brings her out of it. This happened about a year ago and then again on New Years Eve. We have had blood work, etc. done. My fear is that if we are not home, this will happen and we will lose her. Help.... any input? Thanks.