Hi there,Welcome to Just Answer! I would like to help you and your dog but need a bit more information in order to better assist you.
Where do you live now? Where has the dog been (ie where is your Grandparent's place)?
I am currently living in Houston TX. My dog is living in Central Texas, near Hamilton TX. She is out on 42 acres. They have one other dog... and tons and tons of stray dogs come by.
I think that their dog is on heartworm meds... but I'm not positive.
If it has, please hit the green "Accept" button and leave feedback.
I will still be here to provide more information if you need it – just click reply!
The above is given for information only. Although I am a licensed veterinarian, I cannot legally prescribe medicines or diagnose your pet's condition without performing a physical exam. If you have concerns about your pet I would strongly advise contacting your regular veterinarian.
Best wishes to you and to your dog!