Dog Heartworm Treatment

Okay sorry to bother but im a little upset today. In may i adopted a american pitbull puppy, my in laws adopted the brother that was identical to mine. Everything has been great with my puppy, has all his shots and knows tons of tricks. He is absolutely the smartest dog i have ever had, not to forget to mention he is a indoor dog. Now today my sil called me to say that she found her puppy dead! I asked her were there any signs of the pup being sick and she said yes, for a week it had diarhea and lost lots of weight and could not open his mouth to eat or drink water. I figured that he must have been very dehydrated. When we first got the dogs i got my dewormed, in which he had lots of worms and we had to repeat the process twice before they were gone. We told them and they never got the dewormed or vaccinations! They live in some huge home on a oepn field so they have mice and lots of them, do you think the dog ate a mouse or do you think parvo or some sort of disease by the symptoms i told you? Im worried cause a few weeks ago we were evacuated from our home due to the fires in california and had to stay with them for 2 days. I know parvo is contagious, my dog is dog aggressive so we kept them seperated but my pup was in the sectioned off part of the yard that they made for their dog. I really dont want my dog to get whatever he had & im very sad that the dog died…I love animals like you would not believe sad over this. In your opinion what do you think it could have been? Also the pup was about 8 months and he was soooo beautiful… I really think that some people should not own dogs cause if this were my case he would have went to the vet… Sorry to vent on here but none of my little bit of friends care for animals and think im crazy for bein sooo sad..

I have a 2 1/2 year old female, pure bred blue-nosed APT. She’s 65 lbs, always been very healthy, current on all vaccines, we give her a heart worm pill every month & she suddenly has been having this dry, hacking cough that started this weekend. Her parents never had any serious conditions and we haven’t taken her to the dog park in a few months. She hasn’t been to any vet offices, groomers, or anything which would include other dogs or animals. She’s been drinking water and her coat’s elasticity seems to be normal. We also have 2 other American Pits that are showing no similar symptoms. She has had a slight dis-intrest in her food but she’s still energetic and seems to be normal. She has a vet appt. on Friday but I was wondering if anybody had a dog with similar symptoms? Or even might know what it is? I have done a little research on it but it could be anything! I’m hoping it’s just allergies but she has never had this before! Any info would be greatly appreciated!