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Thank you for your question. My name is***** I have been a small animal veterinarian for 14 years and I'd like to help with your question.
Can you tell me a bit more about what is going on. For example, in between trembling episodes, is she perfectly normal? How often are the episodes? And is it primarily her head or her whole body that shakes?
Give me a few minutes to work on an answer for you, but it will help if you can tell me more details.
I am not set up to make phone calls. I can try to refer your question to someone who is if you would like.
Bulldogs (usually english, but american too) can be prone to something called idiopathic head tremors, but this condition is truly limited to just the head so I don't think that is what is going on.
Generalized trembling can be from pain or anxiety, but I also don't think that is the case since she seems to be so normal in between episodes and I wouldn't expect pain or anxiety to come and go in that fashion.
The challenge is that all the other potential causes of tremors like this are either muscle or nerve diseases/problems and these can be very difficult to diagnose. There are some infections... such as neopora or toxoplasma that can effect the brain and cause intermittent tremors. There are some rare metabolic disorders that can cause substances to build up in the muscles and cause occasional tremors. But most commonly there are epileptic type changes in the brain that could potentially cause this. Cancer is also a possibility, but less likely at this age.
The reason that these things are such a challenge is that any testing of the brain/nerves/muscles is difficult. There are not simple blood tests for these problems. You really need an MRI and spinal tap to get to the bottom of it.
Sometimes what I like to do is try some pain relief and/or anti anxiety medications to see if the tremors stop. This is just to make sure that these things are not factors before we send dogs for a very expensive workup. You would probably need to ask your veterinarian about prescription pain relief, but you can try some of the homeopathic anti anxiety treatments you will find at most pet stores. They usually involved DAP (dog appeasement hormone) or some blend of chamomile.
If the pain relief and anti anxiety don't help then bloodwork is next. If that is normal, then MRI, spinal tap, etc. If you can't afford that kind of work up then your veterinarian may do a trial with medications they would use for epilepsy.
Phenobarbital is the first choice, but there are others. I'm glad that she is normal in between, but it is still probably important to try to stop them because they could get worse over time.
I hope that helps, but if you have more questions please let me know.