Thanks to everyone for your wonderful advice! Huey went to bed early on Friday night and on Saturday morning he was back to his old self, his eating and drinking were normal and he had all his energy!! We let him rest most of the day because we had our friends over for dinner and they brought their 4 year chiuaua Mia. Huey had so much fun playing, I'll be sure to post pics as soon as possible.
Again, thanks so much for the advice and support, we've now combed though the entire yard for any stray apples and will keep our eyes peeled!!