Am I being dramatic for not wanting my kids to go to their grandparents house over this? My bf doesn’t see the issue

My bf doesn’t see the issue I have with this and says that I’m being ridiculous. My bfs parents have a cane Corso it’s about 2 years old and basically the size of a small horse. One of the biggest dogs I’ve ever seen. I usually don’t mind dogs or have any issue with dogs I don’t get intimidated by dogs, they have another dog that is sweet as can be but this dog in particular just gives me the WORST anxiety idk why. Like a sinking feeling in my stomach I’m absolutely terrified of the dog to the point I don’t even like being in the same room as it I don’t like looking it in the eyes nothing he just gives me a horrible gut feeling. The dog is super territorial and he’s very hard to read he never wags his tail or anything he just stands there and stares or barks at everyone. Like he’s not playful or anything he’s just very “up tight” like on guard all the time and seems unpredictable. I don’t think he has been properly socialized because he spends a lottt of time outside and most of the time when he’s inside he’s in a crate. He has shown some issues in the past with resource guarding, jealousy over the other dog they have, and has tried to attack my bfs brother once when he was playing with him. I am just not comfortable with the dog being around my kids because we don’t own any pets and never have so my toddler doesnt exactly know how to properly interact with dogs. I have told my bfs parents that I’m not comfortable with the dog being around my kids which he’s usually outside all the time anyways. But the last few times we went over there the dog was brought inside and I caught my bfs dad letting our toddler put his hands through the cage to mess with the dog and give the dog food etc. I told him to please not do that because I don’t want my toddler to think it’s okay to go mess with the dog when nobody’s looking and god forbid get bit or something because again this dog is mainly an outside dog it’s not social at all. Well I caught him again another time letting our toddler stick his hands and arms in the cage and the dog just looked really uncomfortable so I took my toddler in the other room and told my bfs dad again to please not do that it makes me nervous. Well sure enough the next time we went over he did it again and I caught my toddler messing with the cage and he almost let the dog out because he’s seen his papa use the latch to put him in there. The dog wasn’t growling but had his mouth snarled up showing his teeth at my toddler. I about had a heart attack I snatched my toddler up and told my bfs dad that’s exactly why I didn’t want him showing him to mess with the dog while he’s in the cage. Him and my bf both said I was being dramatic and that the dog “wouldn’t hurt a fly”. I told my bf that I don’t even want to take our kids back over there because clearly they don’t respect my rules and keep doing stuff with our toddler that I’ve told them I’m not comfortable with. My bf always tells me that cane corsos are great dogs and would never hurt anyone etc etc but at the end of the day it’s an animal and I’m not comfortable even having the risk of my child being hurt especially with the size of that dog he could bite his arm clean off if he wanted to. Am I being ridiculous to be upset about this ?

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