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I need to ask for some additional information. Once I receive your responses, it will likely take 15-20 minutes to type my response. I hope you can be patient.
Is she putting the foot on the ground and limping or holding the leg off the floor?
Has she slipped or fell recently?
Will she let you straighten the leg out?
Is there any obvious sore areas on the paw or leg that you can find?
When did this start?
Have you checked for cuts, stones, etc to the paw?
Dogs who will not put weight on a leg could have a dislocated hip, or knee injury such as an ACL or CCL injury. You can read about dislocated hips here:
And read about ACL/CCL injuries here:
Since she is not putting weight on it, it probably is NOT a pulled muscle. I would have her seen by your vet as soon as possible.. If possible, contain her in a crate until you can get her seen. If it is a dislocated joint it is best addressed as quickly as possible, though I do think an ACL or CCL tear is more likely. With a partial tear the dog might still try and use the leg, but then injure it more leading to not using the leg at all. With this type of injury, you can usually straighten the leg out and put it back without the dog objecting too much. Slipping on flooring can cause this type of injury.
In addition, buffered aspirin can be given to a dog with a dosage of up to 5 mg per pound every 12 hours. Keep in mind that a dog's body does not metabolize aspirin in the same way as a human and thus should not be given more than a day or two without contacting your Vet. The aspirin may need to clear your dog’s system before other medications can be given, so keep that in mind if you decide to give aspirin and be sure and tell your vet when your dog is seen. Read side effects and precautions here. http://www.petplace.com/drug-library/acetylsalicylic-acid-aspirin/page1.aspx
If aspirin is used, your vet may not be able to prescribe other drugs until it clears from your dog's system. I'd probably hold off on the aspirin if you are going to get your dog in pretty quickly. I would contain her in a crate or very small area to keep her from moving around until you can get her seen. This will help prevent further injury to the leg.
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