So this morning I noticed a lump about 1/3 of an inch across about 1/4 of an inch from Leo's groin area. Google hasn't really helped me and all I could find on this site was info on hematomas and microchips. Its definitely not a hematoma as it is very hard...not sure what it could be? I have to wait until the hubs is home as I do not have a vehicle. Does anybody have any info on a similar situation? Could it be an allergic reaction to something? We did switch the dogs to taste of the wild's blue bag which has fish in it...I think its a salmon formula or something? Not sure if this could influence it because Leo eats canned tuna and is fine. He also has runny stools. =/ help is appreciated until I can make it to the vet. I'm a paranoid mommy and I need reassurance.