So, how do you earn apples in the game besides buying them with real money because I have zero apples.

by selling wolves....

You can explore to earn mushrooms, and if you save up the mushrooms you can buy apples from other players with them. Another way to earn mushrooms quickly, is to do jobs for other players like boarding and battle training. Breed good wolves like defects or boosts (I suggest Divine health's or melas, albinos, ect) and then sell the pups. If you get a Divine health pup then at the lowest, you could sell it for 300 mushrooms. If it's female and has a rarity of over 15, you can make close to 1000 mushrooms or even an apple if you sell it. Same goes with defects, though they don't go for as much.

You can also earn them in the Referral Program (it can be found under Pack > Free Apples and Mushrooms) or by participating in the Full Moon Celebration during the 5th-9th of every month. (found under Realm > Games)