William isn't interested in chews apart from the Antler Chews (different company from Stag Bar) that have been split along the length of them, making them easier to chew but still quite long lasting. Maybe Pepper would like them?
Louis likes rawhide chews but I only buy the ones made by Farm Food because they're definitely made from cow hide. I don't trust what the PAH and others are made of, especially as they're mostly imported from China
Louis is a careful chewer of rawhide and only gets small pieces off, but I never leave him unsupervised, I limit the time that I let him chew, I don't let him have a big drink of water immediately afterwards and I throw the chews away before they become small enough for him to chew without having to use his paws to hold them down. Despite all those precautions I'm still not entirely comfortable with him having rawhide, but when he's in anxious mode or is desperate for a walk and I can't take him out there and then a rawhide chew is one of the best things for calming him down.
Mine also have Fish4Dogs fish twists, but they only take about 30 seconds to crunch them up.
I hope Pepper is feeling better now