Overweight Hypothyroide dog! What to do?

She's 60 lbs but should be 30???  I'd have a talk with the care takers.  They need to feed her the proper amount each day.  If they want to free feed her they can still do that but measure out the daily amount and then don't refill when it's gone.  It would be better if they could give her half the daily amount in the am and the rest in the pm. 
 
But, seriously, they need to feed her the right amount.  She's way too big and no matter what brand you get if she's getting too much she's still going to have the problem. 
 
I'd reconsider this living arrangement if they don't want to budge on this.  It's for the dogs health. 

After managing two dobes with hypothyroidism from early in life until their deaths, there is NO eating freely when trying to manage this disease.  Things must be measured, treats included.  A vet reducing diet is one option.  Reggie was part of the Eukenuba Reducing Diet trial and did very well.  I was able to manage her weight and Marshall's within 5 pounds using that approach.  If you allow free feeding it too must be measured and once it is gone in any given day, not replenished.  Depending on the terrain, food can be thrown freely over the ground (after it was measured) so that feeding takes time, energy and effort.  Again no extra stuff.  If you know dog biscuits are part of the routine, then cut back on the dry food.

Belive me I feel so bad that I see this happening. I really care for her a lot but for now this is the best arrangments I can make. They really like her a lot also but don't understand how it's so important she eats right. Her weight has always been a problem and for a while before she moved I had a handel on it. I didn't mention but she is also keepted with other older dogs and they tend to eat her food also so it's uncertan how much she is really getting. I will be moving to a new home ina few months and can have her back then but for now I just need something I can do. It was either let them care for her or give her up and I just could not see her go. I couldn't belive it the last time I visitted her, I talked to her caretakers and am hoping they will do as I say but they are older and somewhat stuck on ther ways. I also whould like to know what she should be eating anyway just because thats also important to me.

The house she live at is like a farm with plently of room to run around. She gets along great with the other animals there and I can see how safe she feels there. I just worrie about her weight being out of control.

I would suggest pre-measuring her daily portions out and putting them in little containers and provide only a week's worth of food at a time in this fashion to her caregivers. Or if that's too much work for you, if you're willing to pay a bit more and feed one of the few brands they offer, Smartpak will do this for you-- premeasure portions of dog food in sealed pouches, automatically send a month's worth every 30 days. They have a webpage.

It could also be she is eating some of the other dogs' food as well as hers.  Our first golden had thyroid and was on meds and my vet told us to use Purina Fit & Trim.  Between meds and food, we got the weight off and kept it off.
 
Then another golden KayCee, put on poundage because of having bad knees and surgery on them both.   Nothing would take weight off her.  I even had her tested twice in a two month period for thyroid, but both times, negative.  So my vet then said to put her on that Science Diet r/d.  I did and in a few months she had lost that 15 pounds.  I then switched her to the Fit and Trim and she has not put any of the weight back and it has been about two years now
 
But as long as she has access to other dogs' food and is free fed, I think the poundage will stay on her no matter what food is  used.

I'm really surprised, and I guess I'm one of the lucky ones.  Last year in June, my lab, Sassy, weighed 104!!!  I honestly couldn't believe my eyes in the vet office.  I really cut her back but by Sept, she was only down to 98 lbs and that's when we did the thyroid test and she was super low.  I didn't change a thing with her food from that point on and by January, she was down to 78 and yesterday she was 73.  I can only attribute that weight loss to the thyroid meds.  Not sure it's helpful, but I feed her Natural Balance Duck and Potato and I stay closer to the lower range on what the bag recommends.  I agree with idea of premeausuring the food for 2xday feeding. ut it in ziploc baggies and mark 6/28 AM, 6/28 PM, etc.   Just tell the folks caring for her that the vet recommended it so they could determine if there's any other medical issues.

Thank you so much for the idea of premeausuring the food and putting it in ziplock bags! I will have to do that, why didn't I think of it to beguin with? I gave them a measuring cup but it's somehow dissiapeard and they just fill the bowl to the top and leave it out. If I already have it measured it will be easyer for them to just pore the bag in the bowl instead.

Great! My next trip up there is this weekend so I'll get everything ready, I'm also going to do half weight maintence and half regular kibble then the next time swich her to only weight maintence, Just don't want to swich too suddenly. I'll probly also draw blood from her while I'm there and take it back to the clinic I work at just to double check her meds are working just incase her thyroid is the problem for the weight gain. I do know they are giving her her meds, at least they don't have a problem doing that. Just a spoonfull of penutbuter and a pill everyday not a problem they tell me.