Oh that is so scary. You would think that someone who spent so much time and worked so hard to become a vet would be a true animal love and would be incapable of harming one.
I have a friend who has a Pit. This was her first dog and when Bella was 8 wks my friend took her to the vet for the first time. The vet was really against Pits and kept telling her how they can turn on you and she has to be firm which I know with any large dog you have to be firm and really establish boundaries but he was really worked up about it and really lecturing her. Well I know everyone has different opinions about Pits and I personally wouldn't want one although my friend now has 2 and they are very sweet and well behaved. Anyway the vet was being very rough with Bella (a little 8 wk old puppy- not exactly a terrifying dog) and Bella was so scared- she could sense that the vet was angry and didn't like her. Out of nowhere he snatched her paw to clip her nails and out of fear she snapped a little. She didn't bite or even put her mouth on him. He knocked her across her head!

He told my friend, see this is exactly what I'm talking about and if I report her she'll be put down. My friend was crying and was just terrified. She never went back to that vet of course but she was too scared to complain about him out of fear of what he would right on Bella's chart or reporting her and making something up. Very sick!
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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