See page 19 of the rulebook on Pet Cards
Rulings:
- While pet cards can only hold 1 buff or condition, they can temporarily receive an infinite amount. These tokens are all placed on the pet card, but only one of each token (1 buff, 1 condition) will stay on the card. Example: a pet card is to receive burn & poison at the same time. Both conditions are temporarily placed on the pet card, receive 1 DMG for each. However, only 1 of these conditions can be kept on the card, with the enemy player deciding which one.
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