Yes, there are newer studies and research that have added to our knowledge in more recent years, and it’s been putting pine shavings in the bad column in increasing numbers. My philosophy is “when in doubt, don’t.” (Which is useful under many kinds of circumstances, like at work, LOL.
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Anyway, it’s currently controversial enough that a switch to Aspen pellets, or Aspen shavings, is a good choice. I actually had been reading that Pine pellets, like wood stove, were great at the beginning of this year, but then after a long post where a discussion brought out the notion that if I can smell them, the bunny may be inhaling the harmful element as well, I switched. The thing is, there are several great options for bunny-safe bedding, so why not change? Aspen is super absorbent too. Also Yesterday’s News and Care Fresh make great products. Prices are competitive, so why take a chance?
Hope that helped.