Originally Posted by KigerQueen
Founder is where the Lamina in the hoof inflame causing pain on the feet, and can progress into laminates (where the coffin bone sinks and rotates) causing extreme pain and can be fatal (EX coffin bone falling out of the bottom of the hoof). I would get a vet on this asap. Founder dose not cause weight loss and a weight change that quick with stiffness needs to be taken seriously.
You have it backwards.
Laminitis is the inflammation of the lamina (Lamin means lamina and itis means inflammation)
Founder is when the coffin bone moves or rotates.