According to this article from www.webvet.com your furniture may be to blame!
The article discusses how the flame-retardant checmical called polybrominated diphenyl ethers (PBDE) may be the root cause. This chemical can be found in your sofa, floor rugs and other fabrics that are found in your home.
I think it is a good article to read and be aware of just in case one of your pets may suddenly become ill for no obvious reason. I can’t imagine cats as being the only ones who can suffer from this.
Has your pet suffered from illness that was found to be caused by PBDE?