I have one of each and a cat is the easiest thing to toilet train, you drop him in the litter box and bam they seems to know that's where they go. 
 
A cat is much less work but is very independent, if you want an animal that will be your buddy and don't mind taking a dog out 3 times a day then I say go for a dog. 
 
It's great to save a pet but remember they can be very temperamental because many have been abused. We worked with our dog for a long time before he trusted us and became the dog he is today. 
 
I totally recommend saving a dog or cat! 
		
	
		
		
		
		
			
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