Is this abuse?

My 23 year old claimed I was abusive. I never felt like I was an abusive parent. I'm just not a soft parent and I don't coddle my children. He told his therapist a story and she told him that's abuse. I don't think it was abuse. When he was 11 he wanted a dog. I told him he could have a dog but he has to take care of it. It won't be my responsibility. One day the dog got into his backpack and ate his trail mix which had raisins and raisins are very toxic for dogs. I was mad and told him he should not have had his backpack on the floor. He wanted to take the dog to the vet. I told him the dog was supposed to be his responsibility and he is the reason it's sick so I'm not wasting my money. This was his chance to learn a lesson so I had him take a rock and made him put the dog out of its misery. The point wasn't to "traumatize" him. I was teaching him a lesson. And he's saying that was abuse. I feel these psychologist are saying any form of parenting is abuse. It was over 10 years ago and he was irresponsible so I taught him a lesson. I don't think that's "emotional abuse"

Edit: Katie idk what time you grew up in but in my day putting animals out of their misery instead of letting them suffee is normal

Edit2: if you think I'm wrong that's one thing but to accuse me of harming my children because of what happened to a dog is disgusting. Also to say I should have had a rock to my head?! Animals and people are not the same and I don't treat them the same. The dog was sick because of his negligence. I had him put the dog out of his misery