The signs that a dog has heart worms are: The dog pants a lot, and I mean almost non stop; they need the extra oxygen. The drink loads of water and are not hungry They no longer want to go for walks...
You can get them by letting the dog kiss you in the face.
Give it heart pills (maybe and probably it is too late) orGo to a vet ASAP
Worms will make a dog skinny and unhealthy as worms absorb nutrients.
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