Aw, poor Chili!
Angela, it sounds like little Chili-bean might have an impacted and infected anal sac.
The anal sacs (or anal glands) are little glands located at the 4 o'clock and 8 o'clock position if you are standing behind your dog. They are normally about the size of a chickpea. They have a little tube leading from the anal sac to the anal opening, and what Mother Nature intended was that every time your dog defecates, a few drops of the fluid contained in these sacs gets deposited on the poop.
Sometimes, however, the little tube gets blocked and the anal sac cannot empty. Anal sac fluid is continuously produced by the body so the sac gets more and more full. Eventually it can rupture out through the skin.
Given how close the area is to fecal matter, anal sac ruptures seem to always get infected. Treatment requires oral antibiotics since the sac is under the skin and the only way to get the antibiotics to it is by the blood stream, which means we have to give the antibiotics by mouth.
When I see patients with an anal sac abscess, I generally clean the area, start them on antibiotics and then see them back in a few days (once some of the swelling and pain have gone away) and try to express the anal gland to get rid of the blockage in the tube. Often I have to see the patient a few times. Also, I like to see them a week or so after the antibiotics are finished to make sure the blockage (impaction) hasn't returned.
Here are some links to further information:
In terms of what you can do to help today, the most helpful thing would be for you to apply a warm compress to the area. If you have antibacterial soap in the house (Hibitane or chlorhexidene soap would be ideal) you can add a little to a cup of warm water. Put a washcloth in, then wring it out. Hold the warm, damp wash cloth to the swollen area for 10 minutes, rewarming it every 2 minutes or so. Wipe the area with a plain wet washcloth and pat dry.
I do think Chili is going to need to see his veterinarian to get some antibiotics to treat this. However, if your vet is not open at the moment, then the suggestion above may help to keep him comfortable until your vet opens!
I'm also a bit worried that his blood sugar is low due to not eating all day. This is called hypoglycemia. Here is more about it:
In terms of treatment, it is REALLY important that you keep calories going in to him.
Also, offer lots of clear fluids. So, water is fine, but also he can have pedialyte, Gatorade, apple juice diluted 50:50 with water, or chicken or beef broth diluted 50:50 with water. Give the fluids in small amounts frequently. For a dog this size that means about 1/4 cup an hour.
You can offer a small amount of his regular dog food, but if he doesn't eat it offer a bland diet. For patients that I see, I recommend a mixture of 75% cooked white rice, and 25% low fat protein. For the protein you could use extra lean ground beef, boiled with the fat scooped off, or chicken breast boiled with fat scooped off or even scrambled egg cooked without fat in the microwave. Feed small frequent meals. For a dog this size, I would suggest 2-3 tablespoons every 1 to 2 hours.
If he won't take the rice and meat mix, then you could try getting some human baby food in meat flavours (check that there are no onions or garlic in the ingredients) and mix that with warm water and offer that, or syringe it in little bits into Chili's mouth.
Beech Nut makes a line of baby food that has nothing but meat (beef, chicken, turkey or veal) in it. Here's a link:
If you cannot find this, you could find another meat baby food - just read the label carefully to be sure there are no onions, onion powder, garlic, or garlic powder in it.
I would strongly recommend that you keep a tube of nutristat on hand at all times in future to prevent/treat this problem if it happens again. Here is more about it: http://www.agri-med.com/site/255063/product/NUTRST-4.25 It is a calorie-dense paste that you can syringe into them to get maximum caloric impact from a given volume of food. It's very good to have on hand for small dogs prone to low blood sugar as it is such a serious problem!
I hope that helps you. If this has been helpful, please hit the green "Accept" button and leave feedback. I will still be here if you have further questions!
The above is given for information only. Although I am a licensed veterinarian, I cannot legally prescribe medicines or diagnose your pet's condition without performing a physical exam. If you have concerns about your pet I would strongly advise contacting your regular veterinarian.