Touches home for me, we had a pair, brother and sister, that we found abandoned and took them in, great dogs and as close as I have ever seen before, seldom saw one without the other.
They both died of poison a week apart. The better half was deeply affected, both dogs were with her every one of her outdoor steps.
She made two hasty decisions, replace them quickly and have a lot, preventing getting close. Not one to argue with faulty logic I wisely , a rare exception, kept my tongue. She went to the area where we found the original pair, looking for another dog that might have lived from their litter. Clever dude there said he had an offspring that he would part with, six bucks later we had a dog who's closest resemblance was that it had 4 legs and a tail, the next day she went to the local temple, locals drop off dogs at the temple knowing the monks can't turn them away, and picked up two more, three aren't much more difficult than one, where is the problem?
Less than a week later she calls home asking me to bring flashlights to a spot just down the road, two more, a pair of brothers, 4 weeks old pups who had been just been abandoned. If 3 aren't a problem why would 5 be?
Two weeks ago, a three week old puppy was found on the road in front of the garage, three weeks is way to early to be weaned and probably wouldn't make it, but we took it in, it is surviving. It has captured everyone's heart, including the other dogs.
Dog 7, a Jack Russel Terrier look alike, was the straw that broke the camel's back. I found the owner and took it back, I also found the owner of the 3 week old, but nobody, including the owner wanted it to go back. I kind of liked the Jack Russel.
Moral of the story is that two dogs are at a minimum, twice as much trouble as one and after that it is even more exponential if not synergistic.