I have a 12 year old greyhound who is experiencing  difficulty after eating–coughing harshly and gagging.  He eats a wetted-down  kibble mixed with canned food with glucosamine, chondroitin, and fish oil mixed  in.  I have also noticed that more and more frequently when he barks no sound  comes out, and when he does manage to make a sound, it either sounds like he has  laryngitis (very hoarse) or is very high-pitched.  He has always had a  relatively high-pitched “voice” for a greyhound, but recently he sounds more and  more like a tenor. 
I am concerned that I am seeing the beginnings of laryngeal paralysis, and wanted to know if I should take him to his vet now, or if it would be acceptable to wait until his annual, which is mid-January.
He is otherwise healthy, excepting some hind-end weakness which seems to be progressing.
Thank you,
Laurie
