Panting, shaking and restlessness can be a sign of pain. The pain could be the start of pancreatitis or she may have eaten something she shouldn't have. Pancreatitis is an inflammation of the pancreas. The pancreas is a gland that produces and releases enzymes into the digestive track that aid in the digestion of food. When these same enzymes are activated while they are still in the pancreas, inflammation occurs and the enzyme start "digesting" the pancreas itself.
Some common causes of pancreatitis are eating a lot of very fatty foods, obesity, steroid use and other diseases and conditions. Symptoms of pancreatitis vary but include vomiting, diarrhea, anorexia, weakness or collapse, dehydration, shock, fever, depression, and upper abdominal pain. A dog may indicate abdominal pain by acting restless, panting, crying or wincing when picked up, shaking, standing with an arched back, or lying with the front end down and the rear end elevated
You can read about it in detail here:
You might check the anal glands for swelling. Many dogs with anal gland issues will tremble and pant from the discomfort. Many dogs with anal gland problems will drag their behind on the ground or carpet and their anus area may have a bad odor and be swollen.. You will want to check to see if your dog's anus is swollen. This may cause a dog to continue to lick the area. The anal glands are 2 sacs on either side of the anus at about the 4' o'clock and 8 o'clock positions. If your dog is continually licking their anus and dragging it, it could also indicate that they are full. This problem can usually be resolved by emptying out the glands. To empty them or express them, you will want to cover the area with a tissue and press your finger on the dog's anal glands with an upward motion. A foul smelling liquid should come out. If nothing comes out and your dog appears to be in pain, you should take him to the Vet. Your vet can do this easily, as he is experienced at it.
Excellent site on anal glands
If she isn't eating, you want to give her a couple of drops of karo or pancake syrup on her tongue to bring her blood glucose levels up and prevent hypoglycemia which you can read about here:
You might also try some pepcid. Read about Pepcid dosages and usage information here:
Give the pepcid about 45-60 minutes to work and then offer a small portion of boiled chicken and rice (bland food). If you can get her to eat, then you may see some improvement in the symptoms. However, if she continues to tremble and pant and not eat, I'd have her seen since she may be in pain and need pain relievers.
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Since there have been recalls on certain foods, please check the following site to be sure the food your animals eat is not affected. If it is affected, contact your vet as soon as possible. Have your dog seen if they have any symptoms.