The Tender Puppy and Jingle Kitty sets will be available through cumulative charge!
Between August 9th and August 24th, recharge 260 total diamonds to obtain the Tender Puppy set. Recharge 1200 total diamonds to obtain the Jingle Kitty set. You may recharge multiple times from different packs or all at once from a single pack; either will give you the sets once you reach those recharge tiers.
Note: bonus diamonds from the double diamond event will not count; only the original-purchased diamonds will count. (I.e. If you buy 550 diamonds and get 1100 total diamonds from the bonus, only 550 will count towards the cumulative recharge.)