A bite like that from a dog is a very bad sign - sounds like this dog and its owners needs additional training.
In the best of cases, all toys belong to the owner, not the dog....and dogs should yield them without a fuss.
If the dog had no training, all bets are off. If the dog has aggression/possessiveness like this one does - all bets are off...... It's up to the owners to deal with problem behaviours. They rarely just go away.
I've been bitten by my own cats hundreds of times over the years. It's always related to play - or petting aggression. The skin has been broken a few times...
sometimes I gently bite them back - but they don't seem to care.