The appaloosa is not in foal (she has been vet checked) because we thought she was too when we got her before the winter she was a little more filled out (I do not like seeing her spine it seems to stick out on the top of her back) and it was not like that in the fall. She is just starting to be ridden/worked as she was a former broomare and not broken when we got her (could be why the belly?) and lack of muscle. She is also on the same hay/grass regimen as the bay and just a couple handfuls of 13% protein sweet feed mix.
As for worming -- they were both wormed twice in the fall/winter using Eqvalan Gold and once this spring using Bimectin and again two weeks ago using Eqvalan Gold again -- I have not seen a 'power pack' in our small town available can anyone explain what this is? As well I am not aware of the sand flushing -- maybe this will be beneficial as well (they are in a sand paddock for most of the day) can anyone explain how to do this as well .. ?
Again thanks for all of your input (any is appreciated as we are new at this)