i brought my deck to my friends house to

Yes, they're still fine to use — a chewed edge or a couple of tooth dents doesn't affect a reading at all. The only real question is whether the numbers and figures still read clean, so check before your next session.

Check first (2 minutes)

• Bites through a number, title, or figure → pull that card out of the working deck and keep it as a spare; a hole through "7" makes it useless for time-sensitive spreads.
• Tears, flaking corners, or lifted/delaminated printing → same, spare pile.
• Warping — if the deck sat somewhere damp at your friend's place, press the cards flat between two clean heavy books for a day.
• Smudging on the faces means the printing transferred, which means the printing is lifting; those cards are near the end of their life.

Clean it

• Dry brush first — a clean make-up brush or soft paintbrush lifts hay dust and fluff.
• For smudges on the back, a white vinyl eraser used very lightly.
• If there's any urine smell, a cloth barely damp with a little dilute vinegar, then dry flat. Wash your hands after.
• Keep water off gilded edges and off foil, and never use alcohol or a magic eraser on those — it strips the gold in one pass.

Then put them away properly. A hard case, not a soft pouch, and somewhere a rabbit can't reach — that's the part that actually caused this.

One thing worth checking tonight: whether the rabbit got away with any pieces of card. Swallowed paper is a genuine risk for rabbits, so if it ate a corner or two, watch for not eating, no droppings, or paper stuck in its mouth, and call a rabbit-savvy vet if you see any of those. Card fragments are non-toxic, but the impaction is the part that matters.