No, they won't do any harm if they're eaten and not needed. We checked with our vet because our girls share the pellet bowl and that was the only way we could initially get Thumper to eat them - by mixing one broken up with the pellets and of course that meant Coco would eat it too. Vet said that was perfectly fine.
Turns out it actually benefited Coco anyway as she was eventually diagnosed with arthritis herself so needed it anyway!
Turns out it actually benefited Coco anyway as she was eventually diagnosed with arthritis herself so needed it anyway!