Why ???

We are having a hard time with Luna at the moment she is constantly being sick over the last 2 weeks or so and no idea why.

We had her at the vet a week last Saturday and he couldn't find anything wrong and she is as happy as normal, playing and walking as normal we have come to the conclusion that it is diet related, so today training her was with her own food maybe not a good idea as too much, also she is on a new food too as well as having anti sickness pills and anti sickness jab at the vet.

I suppose its going to be trial and error with food unless there is a problem