Last night my golden ret. started to have a raspy cough. she shows no signs of not feeling well?

she ate a "busy bone", which is soft, earlier in the evening. sometimes she tends to lick the rug, which has dog hair on it, after eating a treat. when she is sleeping she doesnt cough but when awake she has this raspy, deep cough. it is not continous but often. i tried to look in her throat & do not see anything. she doesn't cough when you rub the throat either. she is up to date with all vaccinations. could she have a hairball like a cat? or can she have a cold? she was in the car with the windows down a little yesterday and it was 45 degrees. could she have caugh a cold?being christmas eve i cant take her to the vet til tuesday. do you know why she is coughing and can i give her anything? i am pretty positive it is not kennel cough since she isnt nor has been around other dogs. she is eating like normal but has seemed to drink more water than usual today. she coughs so hard sometimes its like she is trying to bring something up.