I have 3 Pusa that are very affentionate and loving and a neighbor cat that's friendly affectionate, I have 2 Aso that are very loyal and loving but I have met a dog that was unfriendly and aggressive which was my sister's. Back in 2001, she adopted a brindle pitbull from a couple that was abused and I think he was used for dog fighting too. He once attacked my dog (died 6 years ago) that's a boxer-mix sa pamamagitan ng taking the tip of her ear off and blood was everywhere. We had to bring her to the vet and had stitches. He also went after my 3 taon old niece (who is now 18). He almost took her whole ear off, she had to have stitches around her ear. so my sister took him to the humane society and had him put down.
Yes, my former neighbor had a cat that was adorable - he would climb into my lap when I was out picking chives and de-weeding the bulaklak beds. Maxine and Martina would just watch to see if he would come to play with them - which he never, but when I went to them they would sniff me with disapproving looks.
As for Aso - there is a dog down the road that keeps barking at me when I go by. He does not want to play - he just is very aggressive. He tried one araw to attack another neighbors visiting dog. The neighbor's dog took up for his visitor and pinned him down till the unfriendly dog's owner came to get him. The owner claims that he is like that because he was abused sa pamamagitan ng his nakaraan owner - however, that does not explain why he goes onto other's property and start a fight.