My dog ​​is lost, what is the reason, do you think he is dead?

I had a dog that I had been taking care of for 9-10 years at my countryside house. Five days ago, he went missing and still hasn't returned. On the day he disappeared, he had been involved in a fight with other stray dogs; he was covered in blood and in very bad shape, barely able to stand. The strange and scary part is that about 10 other stray dogs that used to roam the village and bark every night also disappeared and haven't been seen for the past five days. I don't understand what's happening. Can you help me figure out the reason for this?

My dog ​​is lost, what is the reason, do you think he is dead?
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