Be very very wary of rawhide chews and pigs ears. Twice I had to remove a sodden slimy pigs ear from my Boxers throat. First time when she attempted to swallow it whole I thought it was a fluke and gave her another a few months later, second time she couldnt even breathe. There was no time to lose or think about help, I just had to get it out of her throat.
Rawhide is the same, chews down to slimy slippery mess, they try to swallow great lumps of it and it gets stuck. Some of them cant digest it properly either and can cause blockages etc.
Dont risk it, give the hard crunchy biscuits and chews recommended for their teeth, much better for them and your piece of mind.