From the online Talking Crochet newsletter:
"From Emily:
'Pet owners must also watch out for the dangers of open-weave afghans. Seven years ago, my kitten was running around playing. She suddenly got very quiet, so I checked on her. She had her head through one of the openings in an afghan. It was twisted tightly around her neck, and she was near death. I was finally able to revive her. Since then, I have been more careful.' "
Even when I make blankets for human babies, I use a closed-weave stitch so that they don't get their fingers or toes stuck in the holes.