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How to acclimate two dogs
Perform a scent handshake before the dogs meet.
To give two dogs an introduction to each other before they meet in person, you can do what is called a scent handshake. This is when you swap the dogs' blankets to allow them to get used to each other's scents.
Take the blankets off of the dogs' beds and swap them so that each dog has the other dog's blanket. Try to do this at least a day before they meet to give them a chance to investigate the smell and get used to it.