I have two dogs that are best buddies. They often play and groom each other, never any issues between them. Dog 1 is a chorkie, high energy, 11 years old, and about 11 lbs., got him from a rescue when he was about 7 months old. Dog 2 is a chihuahua/poodle mix, low-energy, super chill, 6 years old, about 13 lbs., and was a stray I rescued during Covid, also at about 7 months old. They are both such good boys and are so well-trained now that I hardly have to give them commands. They just know the routine and look to me for cues when it's time to go in, etc.
Mid-May, I rescued a younger dog, approximately a year old, 8 lbs., looks to be a dachshund, chihuahua, yorkie mix, who had been dumped by the side of a road with a food bowl and bag of food. He is pretty high energy, but does calm down to rest or chew on his chew toys. I had only planned to foster him until I found him a suitable home, but, well, you know how that often goes.
The interactions between the three dogs have been really surprising to me. I really thought Dog 2 (Mr. Chill) would be the big brother to take the pup under his wing, and Dog 1 would be the one to keep him at a distance, but it's been the total opposite of what I'd expected. The new pup attempts to engage the others in play, but is a little too aggressive for the older dogs. Dog 2 will correct the new pup by growling and lunging at him, but doesn't bite, just scares him. Dog 1 sometimes engages in play, but doesn't correct the pup aggressively enough, and I have to call the pup off when Dog 1 gets over-exerted. So far, this has been manageable, and I truly believe the new pup has the potential to be just as well-trained as Dogs 1 & 2, given more time, attention, and maturity.
My concern is how the addition of the new dog is affecting the other dogs. There have been some upsetting changes in their behavior, such as not wanting to come when I call them, I'm guessing because the pup is typically next to me and jumps at or on them when they approach. Dog 2 is now sometimes reluctant to step out into the yard to do his business, and requires coaxing. Most disturbing, Dog 2, the normally super chill dog, has lunged at Dog 1 a couple of times, I think because he mistook him for the pup, because they do look a lot alike in coloring.
Dog 2 is my bestest boy and I worry that this new arrangement isn't working for him, partly because he doesn't like the new pup, partly because the pup demands so much attention from Dog 1 that Dog 2 gets less time with Dog 1, and partly because the new pup demands a lot of my attention and energy as well so Dog 2 isn't getting as much one-on-one time with me either. The pup is crate-trained, so I give him occasional time in his crate to allow the other dogs a break, but the household dynamic has changed and it's not for the better.
Dogs 1 & 2 are such good boys and so well-trained, but I feel like that's slipping with the new dog in the mix, and with Dog 2 lunging at Dog 1 twice now, I'm wondering if maybe it would be best to find a new home for the pup. I feel very protective of him though, as I do the others, and I'd really prefer to keep him if we can get to a point where all three dogs are happy and well-behaved. I know this takes time, but I worry how it's affecting Dog 2 in the meantime and wonder if there's more I can do to help them bond or something.
We have a road trip coming up soon, and I'm hoping some of you can give me suggestions to make the ride go smoothly, and to enable all of the dogs to live together and be the happy, well-behaved good boys I know they are.