Our expert says:
Blood can appear after an animal has been dewormed because the worms cause bleeding spots when they come loose from the gut. They usually bite into the wall to keep themselves in. The two main types of worms are tape worms and round worms and they require specific remedies (some combination remedies are available that will do both round and tape worms - effective meds being available from your vet). Protozoal can also cause blood to appear in the motions. It is good practice to have your vet check your pets motions periodically to see how effectie the deworming has been. Your vet will perform a test on the faecal sample and examine it under a microscope (looking for eggs etc that are not visible to the naked eye).
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