Cute Pet Party is a 400% plush blind-box series from the toy brand Samuel, listed on the official Samuel site under item number MR1042. It belongs to Samuel's plush blind-box line, and at 400% scale these are large, oversized soft figures rather than small vinyl pieces.
The series ships in a full case of 36 units per box, with each blind box sold as a single figure whose design is hidden until opened. The official product page does not publish the individual character names, the total number of designs, or any pull-rate odds.
Beyond the brand, the 400% scale, and the per-case count, the official listing does not state figure dimensions, materials, or whether the set includes a secret/hidden edition, so those details are left unconfirmed here pending a sourced reference.