Is it normal for my dog's back legs to shake while squatting to potty?

Shaking is usually a sign of pain, according to the symptoms I can't be sure where the pain is coming from, possibly from his hips but it could be from somewhere else. I strongly recommend that you take him to the vet ASAP in order to get it checked and treated.

Sometimes the pressure of defecating can stimulated the bladder, and if he is relaxing himself to poo he could concurrently be relaxing his bladder schinter muscle. It is certainly a nuisance but can happen. In a young dog I wouldn't worry too much about this but it would be a good idea to have him examined to ensure that nothing is causing unnecessary pressure in his back passage, such as a large prostate or full anal glands.

Bruno's leg looks like it is in a normal position to me. Sometimes dogs that have knee pain will sure with their knees falling out to the side and slightly extended, but Bruno's leg does not appear to be in that position. Dogs with hip dysplasia can have an abnormal gait when walking or can hop with both legs together when running. If you're concerned that Bruno isn't walking normally you should have him examined by your vet.

That's a good question. Abnormal postures when pooping can indicate an injury, or deformity in the pelvic canal. It can also indicate a problem with a knee, leg, or hip. If he is otherwise normal, then this is not likely something to be concerned about, but can be mentioned to your vet the next time he goes in for an exam; or good to discuss with your vet if he happens to have any other issues with the legs or hips. I hope that helps and all is well with Diesel.

Most likely it is not related to anything and is only incidental. However, this can only be confirmed after a physical exam by your veterinarian. If it persists or worsens, I would suggest a check up to assess if there is any sign of [elbow dysplasia](https://www.petcoach.co/dog/condition/elbow-dysplasia/), [panosteitis](https://www.petcoach.co/dog/condition/panosteitis/) or other condition/injury, as pain can cause shaking in dogs.

It's possible that this could have been a type of a seizure, but there are other conditions and behaviors that could mimic a seizure. If this continues, or Bruno is otherwise acting abnormal, then it's best to have him examined by a vet as soon as possible. If Bruno is otherwise acting normal, then there is no need to rush him to the vet, but it would be good to have a vet evaluate him sometime in the near future, because the vet may detect an underlying problem (i.e. heart or neurologic disease) causing this convulsing. It would also be very helpful for you to record a video of him doing the convulsing behavior if you happen to see it again. I hope that helps and all is well with Bruno.

Thank you for submitting your question regarding Hudson. I recommend that he sees a veterinarian. He may have experienced a seizure. He could also have back pain. It is common for small breed dogs to have disc disease in the neck or back which is excruciatingly painful. His veterinarian will examine and determine if either of these scenarios are possible for him or if he has another problem. In the meantime, keep him quiet and carry him if necessary. Do not give any over-the-counter pain medications as these can be toxic to dogs. I hope this information helps!