Rash identification

What is this? How did he get it? And what’s the best way to get ride of it?

Cutaneous Plasmocytoma Removal

Hello all, I just found out that the growth on my 2 year old terrier mix's paw is a plasma cell tumor! We had a biopsy done and the results came back that it could be either a histiocytoma or a plasmacytoma. Our vet recommended a surgical removal of the tumor from the paw just to be safe (since we dont know definitively if its the more harmless histiocytoma). Prognosis seems to be pretty good since it appears to only be on his paw and shouldnt effect his gait during the healing process. I am still pretty beside myself with all of this information and I really just want my little dude to be feeling healthy. I'm not looking for medical advice!! I guess im posting here in hopes of a few success stories of any tumor removals or plasmacytoma remissions/recoveries in any other pups out there! Or any words of wisdom/advice for an anxious dog mom. We just adopted this guy last year and hes already such an important part of my life, I just want to make sure im doing right by him. Thanks in advance!!

Puppy stoool

Yesterday my 11 week old puppy had diarrhea (minor). First session, she pooped solid Lincoln logs and then 2-5 times diarrhea (wet) Today in the morning, she shat Lincoln logs but now seeing a little blood? Mainly fed kibble, some watermelon, some snacks. Should I be concerned? What am I doing wrong here? Been exercising 15-20 mins 2-3 times a day. She drinks pretty of water. House temperature around 23 degrees Celsius. She gets plenty of sleep