Our first dog is a rescue pooch. A cross, mostly whippet.Absolutley a dream dog to train, lazy in the house, never barks, she just wants cuddles, great around other dogs, really fun to walk made it enjoyable to meet other people out on a walk etc.
Completely fell in love and wanted her to have a companion.
We got a second dog, again a whippet cross rescue who is completely the opposite!
Whilst a brilliant family dog, and very loveable, she is a nightmare to walk, despite 3 lots of training including 1-1 with a behavourist , she will turn into whirl wind of teeth and snarling when other dogs cross our path. This means the joy of 2 long walks each day is minimised and it became a bit of a chore as we now have to keep her on the lead, unless in a large field where we can see there is nobody approaching, even then I'm on edge looking out to call her back in case someone appears on the horrizon.
Dh still laments 9 years on that he wishes we stuck to one. In fact he projecting that fear on to our unborn twins and says what if he doesnt love them as much as our DD after all thats what happened with our mutts!
Oh and yes its harder as people dont mind one doggy vistor, but 2 is considered a bit much, and they dont want to look after a demanding dog so you end up forking out for 2 lots of kennel fees if you want to go away.