A few moments ago our 1 year old female dachshund seemed to be asleep in my wife's lap. My wife was going to get up and tried to wake Tinkerbell. Tink did not respond and seem lifeless. Her eyes were rolled back and her head was limp. I jumped and picked Tink up and she woke up and seems to perfectly fine. This scared us. Does anyone know what this is called or what causes it? Is is dangerous?

It is nothing I am familiar with. I wonder if it was something like the seizures dogs sometimes have when they are awake. Well, as usual, better call the vet in the morning.