If you are someone who suffers from recurrent boils in this area then do please go and see you GP because it may be that you need a cause of antibiotics and an antibacterial wash. If this is a recurrent problem then we often prescribe a longer course of antibiotics to try and break the cycle.
This is because a giardia infection interferes with digestion and inhibits absorption of nutrients from the diet. It can also damage the lining of the intestine. In fact, this particular parasite is at the root of many cases of chronic GI inflammation in dogs and cats.
Giardia interferes with the absorption of nutrients from food. As can be expected, when you don't get the nutrients you need, you lose weight and appear to have less energy. Dogs with giardiasis may have no symptoms, as is the case in most dogs, or diarrhea and vomiting. In the majority of cases, blood is not found in the dog's feces.