HELP been having problem with bichs coat/skin now feeding wafcol fish/corn have seen big improvement after 4 months its hypoellergenic free from wheat gluten,barley,rye etc trouble is my was very active 2 yr girl is not the outgoing active dog she was she seems to have slowed down.Is she lacking some vitamin/supplement ? should i be giving her one of these.She seems to have losy her sprarkle