is it weird to cry over the death of a dog that you never really took notice of?

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we had this dog for 12 years since I was around 5 yrs old, and I never really cared for it, never played with it, i dont really regret not taking note of it because my other family members always did. But now my parents just told me they euthanized it and I have been crying on and off for hours (so much that i have a headache and i still am crying while writing this) and I feel really depressed and my other family members are either not crying at all just saying it had to be done or only crying for a few minutes...why am I crying more than them, they knew the dog more than I did