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The plastic cone keeps him from opening his mouth, it is so tight. When he got home, he squatted in front of the food bowl, his plastic cone sitting in the food, but there was no way he could position himself to actually reach food or even open his mouth. We took it off.
A little while later, the vet called and asked how things were going, even though we had just been home a little while. I told her about the cone and food problem. "Oh yeah, you can take it off for him to eat."
Actually, he hasn't worn it since. Even my husband thinks it is too harsh and has him back in the soft cone. We are going to find some Velcro somewhere and try to redesign it so at least he can open his mouth.