my dog has worms and we used the safeguard stuff and it didnt work at all so how well does the d-wormer stuff work?

my dog was tested positive for heart worms he got treated for it it took 3 tries before he was tested negitive for heartworms now he is taking once a month pills how long does he need to take them before i can stop

im short on money my vet told me he had parasites because of blood in his stool .i wanted to know if amoxo 500mg would cure or hurt him?

on the shelf.. does anyone know why and what else can i use to treat them?

I have a 1.5 year old yellow lab who was eating grass for the last couple of days. This morning he vomited and had 1 (looked like spagetty worm) in his vomit and then just grass. I have found no worms in his stool. Does this mean he has worms and should be treated, or maybe injested this one and now is gone? That might sound silly, but there were just no worms in his stool at all. Thanks