Cougar was a retired racing greyhound. I had him for almost five years. He had been really sick and lost almost 35% of his body weight, but I thought we had it under control. He had started gaining the weight back & was showing good signs of recovery. Last night, he vomited his dinner (which wasn't unusual for him, even before he got sick). This morning he started shaking, then he lay down, screamed once and died.