He poos blood for awhile now, we brought him to a vet and they said to leave him alone, is that the right thing to do?

Frontline Plus for Dogs
Advantage for Dogs

K9 Advantix for Dogs

PNP Glucosamine Chondroitin MSM for Dogs - 60 Chewables

Cosequin DS (Double Strength) for Dogs - 250 Tablets

PNP Liquid Glucosamine Chondroitin MSM HA for Dogs - 8 oz

Greenies for Dogs