our 7 pound chi had surgery for severe luxatting patella last summer. We brought his stroller in the house and just pushed him around in whatever room we were in. At night we put it next to our bed. The peeing/ pooing was difficuly
t since he could not put weight on his leg at all and holding him was tough...he wouldn't go so we put pads in his stroller too and just cleaned a lot! It didn't cause issues as far as potty training afterwards.
he did have a fentanyl patch which caused him to get seriously and scarily high. We had the vet remove it. I would never put him through that again. We also bought a soft cone of shame on Amazon. It was more comfortable for him.
good luck with the upcoming surgery.