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Hello. Thanks for the question.
It sounds like he has a fever and and oral ulcers (to cause the drooling). This is usually due to a viral infection- Calici Virus is the most likely. They can also have secondary bacterial infections. If you want to check a temperature, you can use a digital thermometer and take a rectal temp. Normal is 100-102. A fever is > 103.
The treatment is usually with some fluids to rehydrate- just something under the skin or Sub Q fluids. I also like to put them on an antibiotic (Clavamox or Doxycycline) and an anti-inflammatory (Onsior or Metacam). The combination usually breaks the fever and gets them back to normal pretty quickly.
I hope this helps, let me know if you have any other questions.