Hi, I have a 3 1/2yr spayed shepherd. I had her spayed last April. In Jan. at around 11:30p.m., she had some type of seizure or something, not sure. I was up and she got up from sleeping and was staggering, falling down staggering. She couldn't seem to get a sense of balance. She was coherant and knew me to come to me, or try to. I was in a state of panic. All the other dogs were fine. I let her outside thinking she was going to be sick, but I called her back in worried sick. I got her to lay down next to me her gums were practically white, she had her claws into the carpet like she was trying to hold on. I'm racking my brain on where to take her, my closest vet 20 miles if I could get a hold of someone to meet me, wondering if she is dying, if she would live long enough to make it there. If I would even be able to lift her to carry her to the car if I had to. I didn't see anything in the house she could have been in, and the others would have joined in if there was. She started drooling. Then it was over, and she had to go out to potty. It lasted maybe 5 minutes that seemed like an eternity. She stuck to me like glue afterwards, and I stayed up half the night with her. It has happened 3 times since, that I have seen. None were as severe as the first time. She has gained 20 pounds since being spayed last April. I've been feeding Canidae for probably 5 months now, was Nutro and Chicken Soup before. She does not free feed, has a very healthy coat. I have had her almost 2 years. I got her free from some people that couldn't care for her. She was full of all kinds of different worms, lyme positive, poor, thin, dull coat, and lethargic. She is still very low energy, alot lower than what I think it should be for a dog her age. I had questioned several vets on her weight gain, but they had said it was because she was spayed. I took her in after the seizure and had blood work done, urine, and fecal. Everything was within normal, some things at the top of within, but still within the guidelines. I wanted her thyroid checked, and that came back within normal. I was told normal is 1-4, she was 1.1. And told her thyroid had to be okay because her coat was good. Negative lyme and heartworm. There so far are no answers for her episodes, and the only reason she is fat is because I feed her too much. We do agility from April to November. We have equipment set in the yard we practice on practically daily, except in the winter. In the spring/summer/fall we walked 3-7 miles 5 days a week. My other 4 dogs, 1-1/2 yrs, 8 yrs, and two 13 yr olds are fed twice as much as her, and they are lean and healthy.
I was told to track her episodes of what she ate, what she was doing, when, how long, and anything else I can think of.
I am at a loss, and thought maybe someone here might have some idea of what is happening to her.

Cushing's disease is one thing that comes to mind. I believe, however, it mostly affects older dogs. There is a specific blood test that confirms a diagnosis of Cushing's...I can't say if a regular blood test, such as you had, would lead a vet to consider or rule out the possibility of Cushing's.

Weight gain can certainly be a problem with spayed and neutered dogs but 20lbs in one year is really a significant increase. How much food are you feeding?

The last several months one scoop, 2-1/2cups. She acts like I am starving her. I don't know if I can give her something with virtually no calories to help fill her and cut her dog food to half? She is kept very active 9 months out of the year. We do get lazier in the winter, but still get out daily to play in the yard.

I do not know if Cushing's was tested for. We are do back for a weigh in, and I can ask when we go.