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Hi. My name is***** and I am a veterinarian that can answer your question. I understand that Micha has been chewing the feet and there is a red/brown color at the base of the nail, not to mention diarrhea. How long has this problem been occurring?
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A food allergy is very common in dogs under 1 year of age, so that would be high on the list of possibilities. I am curious, though, if a recheck fecal exam has been performed to absolutely confirm that all the parasites have been resolved?
It is most likely the parasite has resolved if it was properly treated, but it would be a shame if we started treating something different and it happened to be the same parasite this whole time. A recheck fecal exam is good medicine, but it might be correct that it completely resolved. A food allergy seems most likely in this scenario. This is a pretty common occurrence in a dog under 1 year of age and signs are often observed with loose stool and excessive itching (i.e. chewing/licking) of the feet. Other things such as vomiting can also be observed, but any combination of the above can be a food allergy. The chronic licking/chewing behavior can cause pigmentation of the nails (i.e. brown/red), but also a bacterial or fungal infection of the nails can cause that too as a result of all the chewing.
A good treatment approach would be to change the food to a hypoallergenic diet, which can only be purchased through a veterinarian, and foot soaks with an antibacterial/antifungal solution for 14 days. A diet trial takes a minimum of 1-2 months, but that would likely determine if the food is the root cause of this.
A fungus/yeast organism is very likely. The question that also should be asked is, "How did it get there?" In many dogs it is from an underlying food allergy and disruption of the skin barrier from the chronic licking. There are only a few brands to choose from with a strictly hypoallergenic diet and these consist of Purina HA, Royal Canin Hydrolyzed, and Hill's z/d.
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An allergy is not something they can unfortunately grow out of, but it can be easily managed by avoiding the foods that cause the issue. There is also the possibility of an environmental allergy, but she is a little young to expect this as the primary underlying issue. Her history of having diarrhea and young age makes her most likely fit a food allergy. The goal of doing a food trial with a hypoallergenic diet is to remove all foods that can potentially cause an allergy. You can then slowly integrate one ingredient at a time to see if she has an "itch response," which would indicate an allergy. It is better to do this now because as she gets older she may develop an environmental allergy, which will make testing for food issues more difficult.