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DT ate a long post about arrythmia--dagnabit1
A greatly shortened version here: Yes, do get the echo done by a cardiologist--it's worth it for the information it will provide.
Mexitaline--is one of the first drugs used for arrythmias and is effective but needs to be constantly monitored because of possible side effects. There are other anti-arrythmiacs which are more commonly used when starting a drug regimen for a cardiac patient. Sotalol is one (there are others). Mexitaline is more often used as last ditch efforts to control arrythmias. One of the side effects is that some dogs stop eating and won't eat. I went through this with a 12 year old Dobe bitch who I was dog sitting for a friend who was out of town a lot for work. She had lots of arrythmias--and the number was rising--so her cardiologist put her on Mexitaline--she would NOT eat--it came down to the point where it was a choice of arryhmias or starvation. In the name of the comfort of the dogs last days the cardiologist, her owner and the regular vet (who is also a Dobe breeder)they took her off the Mexitaline raised the amount of sotalol she got and she lasted a little over another month but she was happy and had a good appetite and was with me when she died. That was after a good dinner I got up to give her the last pills for the night and take her out to pee and she was gone--curled up in her dog bed--I think she left in her sleep.
But talk to your vet or whoever wanted to prescribe the Mexitaline right off the bat and getting a echo done is something I'd do sooner rather than later.