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Hello, JACustomer. I have been a Veterinary Nurse for over 15 years and would be happy to help you today. I'm reviewing your question right now.
1) Can you describe the situation that lead up to Ralf's paw being affected? 2) Will you please attach a few photos of the paw? 3) Was the paw swollen before soaking? 4) What made you believe the paw was frozen?
At this point my concern is past that of frost bite. Whatever caused the line is likely what caused the swelling, too. It sounds like this may well have originally been a strangulation injury which was made more obvious when the foot was warmed up and the tissue was no longer suffering from vasoconstriction. I would recommend an exam by a vet, diagnostics and likely a preventive course of antibiotics and pain medication. If this is frost bite, over the days to come the tissue may begin to die off and slough at which point he will be in more discomfort and you'll, again, need to get your vet involved for care which may involve tissue debridement on the paw and a series of bandages until the area stops sloughing and begins healing.