Hello I am Dr. Joey. Thanks for trusting me to help you and your pet today. I am a licensed veterinarian with over 15 years of experience. I look forward to working with you.
This does concern me. We must rely on you as the person who knows Monty best to be able to determine if this vocalizing is due to pain, stress or something else. If you feel he is experiencing pain, perhaps he has some joint pain or cramping after exercise. It is good that upon an exam last time nothing terrible was found. If this was my patient and if it had not already been done I would recommend some screening radiographs (xrays) to look at his joints (hips in particular) just to determine if there is any level of dysplasia or arthritis. If this looked good then perhaps you can discuss doing a trial with a pain relief medication at home (to keep on-hand for when he has this experience). If there is no response to pain relief medication, then perhaps this is not pain related. In that case (no response to pain medication), then we must consider perhaps, he has true weakness from something else such as a heart arrhythmia or truly weak muscles (Myasthenia gravis) or another electrolyte/glucose issue.
I cannot recommend any safe over-the-counter pain medications to try. Most carry significant side effects and I am not a fan of aspirin since it always carries a high risk for stomach ulceration in dogs. I advocate if you are thinking a trial with pain relief sounds like a good option to phone your vet and discuss this over the phone (perhaps even avoid another office visit).
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