These symptoms need your immediate deep concern. Sudden appearance of lumps and bumps is very common among dogs but if they start bothering your pets then definitely there is something serious going on. They need an immediate medical check up and few particular tests to know if they are suffering from some fatal diseases. The lumps and bumps which appear and grows faster than usual and even start bleeding can be cancerous cells' growth. If you start treatment in initial stages then chances of recovery are higher. Take it to vet immediately.