My dogs get a shot of homeopathic zeel and traumeel every 3 weeks. I understand that those remedies treat pain and inflammation. How long do they work for? Is it like an aspirin where it works for a few hours, days etc... and then the inflammation or pain returns? Is it worth continuing to get this if it only lasts a few hours or a day? It seems that it might be a waste of money if it doesn't mitigate for the longer term. Does anyone have any thoughts on this? Thank you.