2 dogs here, to be honest it really isnt that much more hassle, as most dogs get on with each other and theyll enjoy each others company, downsides are you need more tennis balls, poo bags, and a bigger car to take them with you places, also one dog is greedy and will nick the others food so segregation at feed time is needed and im thinking of building a kennels for them outside for after walkies so they dont stink the house out ( its a small house)