Laryngeal Paralysis

Laryngeal Paralysis, ever heard of it? Jojo my Brittany was diagnosed with it Sunday night at the Emergency Vet. Sunday night his breathing was very labored Yesterday and today not as bad, think he got scared which scared me and him more. Took him to the EV and that was his diagnosis after X-rays showed negative and he ran a scope down to look at the larynx and throat.