Mine mostly get Cheerios for treats and they're perfectly happy because they don't know any better.

My daughter is a vegetarian and I got her some veggie sausages and she hated them. I've been cutting those in bitty pieces and they go crazy for them. They also get a half of a Petrodex Dental Chew about every other day and they LOVE those. They also really help with the breath so I also love them. Sugar doesn't really play with toys but Gracie and Spike will play with anything as long as the other one wants it.
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"If you have men who will exclude any of God’s creatures from the shelter of compassion and pity, you will have men who will deal likewise with their fellow men." — St. Francis of Assisi, 1181-1226