Pet affection levels nerfed?

Does anybody have any tips on raising pet affection levels fairly quickly? I have sooo much pet food right now and nothing to feed it to because I need pet affection levels on multiple characters to evolve them.

dont play nightmare

u need to play hard or less to get more exp. Your charackter get in that levels more exp

the Pet get the same 

Level your pet while leveling a hero on freeplay hard, or do tons of harbinger :)

@Woqini quote:

Level your pet while leveling a hero on freeplay hard, or do tons of harbinger :)

Ps4 doesn't have that updat yet. Besides, pet affection is wave based and not exp based.

If you have good tower stats, you can set up a low difficulty onslaught and make it as far as you can. It will always take the same number of waves for pet affection, but at least with onslaught, you don't have to rebuild the level every 5-7 waves.