A few simple supplies on hand in case of emergency. 

Learn to take you dogs vitals, heart rate, breaths per minute, temperature, and more How to Take Your Dog's Vital Signs, It can save his life!

 It is a good Idea to do these things when he is healthy so you can tell the marked difference when he is not well. These few things can help assess your dog so you can tell the vet what is going on. It can be good for you to assess your dog like this so when the vet does he does not feel strange.

Do not use Tylenol on dog.

Find out where the emergency vet is located before you need them. it can be so hard to find them in the middle of the night when you have a sick dog.

Poison control number (888) 4ANI-HELP or (888) 426-4435// Things poisonous to dogs

Thermometer, digital is best you take it rectal, normal temp ranges from 100.5 to 102.5

a muzzle, a ladies nylon hosiery can be used in a pinch.

Bottled Water

Tweezers

Scissors

quick stop

Triple antibiotic ointments there are ones that have a numbing agent included.
Hydrogen Peroxide will clean wound but will change hair color.
Betadine to clean wounds
Benedryl (for allergic reaction or bee stings, at a rate of ½ mg per pound of body weight)

PeptoBismol or Kaopectate ( tummy upsets, minor diarrhea)
Pedialyte electrolyte replacement liquid, get one without flavor.

ice bag

gauze bandages
Medical or sports tape
Ace wrap bandages

Syrup of Ipecac only use it if poison control suggests it. vomiting can make it worse depending on what is ingested.

watch for these symptoms, the vet will ask you about them.

diarrhea, fever, vomiting,  Lethargy ( overly sleepy or lazy ), crankiness, no eating or drinking, Hiding, Swellings or lumps (abscesses or tumors), Draining wounds.