i don't prefer one because i have both Cat and Dog,and proud to say that they are very close even mostly says they are best enemy's ..
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They cuddle, sleep together, eat together and even warm up next to each other if the weather is colder.
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Interestingly, the dog chases other cats that accidentally stray into my yard. 
Lol my dog almost killed a cat that trespass my loan last year because of trying to steal the toy of my cat,lucky that i am around so the attack stops.