Is canine lupus caused by diet?

My dog was overweight so i put her on a diet. She is a border collie mix and and she ate 2 cans a day with a cup of dry with each. When i put her on the diet i cut the 2 can a day to one can and kept the dry the same. over 6 months later she developed lupus. I heard it was likely caused by heredity but i was wondering if the diet was the cause also because i would like to put her on a diet again because she is still overweight...

if anyone has any kind of information it would be really helpful thanks :)

Nobody is 100% certain what causes canine lupus.

My dog has the dicoid lupus (makes his nose look funny) not the systemic, and I use supplements to help with that (he's pretty under control on a good diet with extra vit E and occasional periods of antibiotics and an antiinflamatory). I've done a ton of research trying to find out what causes it and how best to treat it - and really, nobody has any answers for what causes it. I have found that a higher protein, fish and potato formula diet helps him a lot. I've got him on the Canidae, grain free salmon formula now. But, this is something that is common in shepherds and some of the "collie" breeds like BC's and Aussies.

If you really want her to lose weight, increase her exercise. The more calories burned, the less she'll weigh.

http://www.natural-dog-health-remedies.c...
You might want to look at this website. If you Google you will find more like this one. Basically it is an autoimmune disorder.