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Hello I am Dr. Joey. Thanks for trusting me to help you and your pet today. I am a licensed veterinarian with over 16 years of experience. I look forward to working with you.
I might need a bit more information to be able to get you the best answer:
1) How long have you noticed this swelling (just today; few days, etc)?
2) Is it just one leg or both hind limbs? And does it involved the entire leg or just a part of the leg?
3) Is she otherwise doing great (no vomit, diarrhea, coughing)?
4) Does she have any known medical conditions such as heart disease?
Thanks. This can help me understand what is going on a bit better.
Always highly unusual to have this much swelling for such a significant portion of the leg and with pitting edema, which is when you notice serious swelling at the bottom. This is one of those situations that really must be seen by a veterinarian as soon as possible. Our top concern with this is if there was a bite/sting (snake, spider) or this could be a vasculitis (inflammation of the vessels) which can occur for a variety of different reasons and there are other causes such as acute allergic reaction, low protein disorders overall in body (but would expect to see edema elsewhere), tick-borne diseases (they cause the vasculitis), tumor and the list continues.
At home about all you can do is hydrotherapy which sounds like you did. I am not sure that Benadryl would help but you could certainly try (1 mg per pound every 12 hours) but I recommend have her seen as soon as possible.
I am at a point I need to know what questions you have. I hope that the information I provided has been helpful.
Please let me know if for any reason you need further clarification, have more questions, or were expecting a different type of answer.
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Great pictures. Thank you.
Yes that is edematous swelling. I wish I could provide you with an exact diagnosis for the cause, but unfortunately this would require an exam and then possibly some testing to try to narrow down what might be going on.