Are apples bad for dogs?

Online Answer
Apple slices make a delicious, healthy snack for your dog and can help keep your dog's teeth clean and their breath fresh. However, the core of the apple and the apple seeds especially can be harmful to dogs. Apple seeds contain a small amount of cyanide which is released when they're broken or chewed.
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Another way to use apple cider vinegar when cooking is to make a marinade. In fact, apple cider vinegar is a popular ingredient in many steak marinades, as it gives the meat a nice sweet and sour flavor. Combine it with wine, garlic, soy sauce, onion and cayenne pepper to give your steak a delicious flavor.
I use it to make veggie pasta salad/slaw, but it can be used to make zucchini pasta. Simply "peel" the zucchini with the peeler and voila – little veggie "pasta" strips!.
Tart fruit, such as kiwis, black currants, granny smith apples, lemons, limes, and grapefruits pair especially well with dark-roasted coffee. In particular, you'll find that tart fruits pair exceptionally well with dark-roasted Costa Rican coffees and Brazilian coffees.
Answer: It the apple's apperance will change,brownish discolartion occurs if exposed to oxygen for a certain time and temperature.
Heat a saucepan with water (at least 3 inches of water so that the poached egg doesn't get stuck on the bottom of the pan). Add a small amount of apple cider vinegar or lemon juice to the water (the egg white becomes firmer faster if you add vinegar, but it's not essential if you're not making runny poached eggs)..