Welcome to Pet Talk, Kathy and Pepsi. Sorry you didn't join us under a more happy occasion. I think it is not uncommon for older dogs to slow down a bit, but it sounds like Pepsi is depressed or feels bad.

I have no idea how to answer your question on the supplements. I wonder if a second opinion would be in order? I do hope you can get some spunk back in Pepsi! I'm sure someone else will have a better idea for you.

Logan