So very sorry about your loss. Yes, even the best trained dalmation can turn and snap without warning. Several years ago, I saw an AKC dog show where a gorgeous dalamation had won best of breed and on to best of group. At best of show, the dog snapped at the judge when being examined. He was excused from the ring, on the spot. Deep sigh.
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The bottom line is he was YOUR fur baby and eventually fit into your home. That is a blessing. Check out Rainbow Bridge. Sending comfort your way.