It is not a meme. Rescue dogs often have issues. While not all, probably >50% in my personal ~10 dog sample size. At 50% it is worth a warning to new dog owners and shouldn't be outright dismissed.
Rescue dogs are usually surrendered because the owner didn't train them. So even excluding any emotional issues, the dog has to be broken of bad habits. A new puppy won't soil where it sleeps, so house training is easy. But a dog that's been locked up most of it's life will, and extra effort in training is needed... not the best for a new dog owner.
Rescue dogs are usually surrendered because the owner didn't train them. So even excluding any emotional issues, the dog has to be broken of bad habits. A new puppy won't soil where it sleeps, so house training is easy. But a dog that's been locked up most of it's life will, and extra effort in training is needed... not the best for a new dog owner.