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1) What color are the gums?
2) Are there any other signs (appetite? vomiting? stool?)
3) Are the front legs normal?
4) Are both back legs equally affected?
While orthopedic / hip disease is always on our mind - you raise a concerning piece of information - gums that are more pale than expected.WIth pale gums, that can mean bleeding or anemia, which can lead to weakness, and then as you see - hind limb (commonly) difficulty.
Pale gums can be from hemolysis (breakdown) of red blood cells such as in hemolytic anemia or even toxins such as rat poison.
Since I can not examine your dog, this is only based on your description of the gums, but would be a concern as I was suspicious of why only a 4 year old dog would have hip disease.
For this reason - I would get to your veterinarian as soon as possible, when they open - or even to the local ER if your vet is not open.
If they believe the gums are pale as well - blood tests would be needed.
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