Hi ! I am Ashley and I own a full-grown Dalmatian. She is always that happy pet would never fail to wiggle her tail frantically whenever she sees me. She would always jump from happiness upon my return from work. There comes a point when I was giving her a bath and suddenly I felt a lump on her head. We didn't make a big fuss out of it because we thought its just caused by bumping. After a month, the lump is still there and we noticed her sudden loss of appetite. We brought her to the vet and she said that let's hope that the lump is not cancerous. According to the vet, if your dog suddenly experiences lethargy and loss of appetite, and even vomiting blood, then that means something is severely wrong. Always make it a point to have a regular vet visit to ensure your dog's health. Look for all possible signs like unexplained lumps, loss of appetite, lethargy,and vomiting. Hope this post helps in making you aware of your dog's health.