Yes, they do know, but if your dog’s friend died away from home, say at the vet’s office, your dog will not know that. So as soon as he got to HIS friend’s house, he ran to look for his buddy. So he definitely knows his friend is “gone” he may not connect that with death. Dogs do understand death, which is why we have our dogs go to the long sleep at our house. Then the housemates get a chance to see that their housemate has passed and they will miss them but they know what happened. Of course you wouldn’t really expect to have a non-related group of friends do that, but just explaining that, not having seen his friend dead, he just knows he is gone. He will be OK with it, just give him a little time to get used to the new one.
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