I am hoping for some advice please, all will be gratefully received 
We have an 18 month old female JR x Chihuahua. She is good as gold, very affectionate and well-trained and loves other dogs. She had so much fun playing with my Aunt's Yorkie the other day that we decided to get her a playmate.
We have found another female, same cross-breed and will be getting her next week.
I am just wondering if there are any definite 'dos' or 'don'ts' when it comes to introducing them? My main concern is sleeping; our dog sleeps in a cage and she often spends time in there (with the door open) through the day too. Should we let the puppy sleep in there with her? Or nap though the day? And do we feed them together, or feed one in the cage maybe?
Thanks for any advice, we are so looking forward to getting the puppy and just want them to be good friends

We have an 18 month old female JR x Chihuahua. She is good as gold, very affectionate and well-trained and loves other dogs. She had so much fun playing with my Aunt's Yorkie the other day that we decided to get her a playmate.
We have found another female, same cross-breed and will be getting her next week.
I am just wondering if there are any definite 'dos' or 'don'ts' when it comes to introducing them? My main concern is sleeping; our dog sleeps in a cage and she often spends time in there (with the door open) through the day too. Should we let the puppy sleep in there with her? Or nap though the day? And do we feed them together, or feed one in the cage maybe?
Thanks for any advice, we are so looking forward to getting the puppy and just want them to be good friends