my black male guinea pig died, i noticed it on its back not moving and i imeddiately started crying but then my husband noticed it moving a tiny bit so i held it and it kept choking kinda coughing noises and opening its mouth wide and it felt very cold and it then proceeded to die 4mins later what was wrong with him does anyone know?? im kind of scared that my 2 female guinea pigs will catch it or that the dogs could to