I see your point about parts breaking apart being a concern.

How familiar are you with TPU? It’s quite durable and robust. It’s a plastic currently used in many dog toys. Between that and Part of me feels like TPU being a soft plastic that would minimize risk.

TPU.

ABS is a beautiful filament, but it’s somewhat similar to PLA in its properties.

TPU I fun to play with and its flexibility offers different properties than PLA