He may be grieving and is angry because he thinks you took his friend away.
My male started charging me and growling after we had to put our female down. He hated her but she was his security blanket. So, when she was gone he blamed me.
I tried CBD oil and extra love and spoiling. It helped but he aged very quickly and passed a few month later.
Can you get another dog?
I have had 4 rescue Basenjis and have spent thousands of dollars on things they killed.
My last 2 didn’t really like each other but did well out of the crate. Once they proved to me they could be alone and not destroy anything they were left out.Once, the male ripped a pillow and the next day he went in the crate when we went out. He was smart enough to figure out why he was crated. Each a Basenji is different and you won’t know until you get yours.
Our first female would be covered in feces and urine when crated and there was blood on the gate.