@WatchTheStormTouchDown I can understand why your sister wants the dog back, she’s come home unexpectedly, her marriage has ended, the children are unsettled, and she’s trying to restore something familiar and positive for them. That’s a very human impulse.
But none of that changes the fact that she gave the dog up. Not temporarily, not informally - permanently. She and her husband agreed to that, the microchip and ownership were legally transferred, and you took on full responsibility and costs. No one was coerced. They made that choice because it suited their plans at the time.
If someone in her current situation were asking whether they should get a dog, the answer would be a clear no. Newly single parent, two children adjusting to a major upheaval, likely needing to work full-time, and no stability yet. That is not a setup where a dog’s needs can be reliably met.
And it’s worth asking: If the dog was so essential to the children’s wellbeing, why didn’t they take him abroad? Why was “time-share care” even considered? Why was giving him up seen as the best option at the time?
The dog is not a toy that can be passed back and forth when circumstances change. He has settled, bonded, and built a routine with you. Seven months is long enough for a dog to attach deeply, especially a sensitive, intelligent breed. He has a stable home, consistent care, and a family who love him.
Your sister’s situation is sad, and her desire to make her children happy is understandable. But it doesn’t override the dog’s welfare, nor does it undo the fact that she relinquished ownership. Legally and ethically, he is your dog now.
You are not being unreasonable. You are protecting the dog’s best interests. A permanent family rift would be tragic, but it would not be caused by you, it would be caused by people refusing to accept a decision they made themselves.
I inherited a standard poodle and no way would I have given her up to the original owner, who admitted that she had fully become my dog even through they brought her up for the first 7 years of her life.