Dog Fainting or collapse

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http://www.k9puppydogs.com/html/dog_fai ... llapse.htm
There are two main types of collapse that dogs can suffer though both can have diverse causes. The first is fainting, when your dog simply drops goes completely limp and appears to be dead. The second is an epileptic fit, where your dog loses consciousness and drops but is rigid and twitching or shaking all over. (See content on Epileptic fits and Convulsions) The first time you see your dog collapse it will be very difficult to distinguish whether you should treat it as a fainting spell or an epileptic fit. At this moment it is crucial that you not fall apart or become useless to your dog through worry and anxiety. Normally a collapse will last from a few seconds up to a few minutes. Regardless of the reasons your dog suffers a collapse don't immediately try to move it. First you must make sure that your dog is breathing properly and that there are noobstructions (including your dog's tongue) blocking his airway. If your dog is suffering from an epileptic fit try and dim the ambient light and remain quiet and calm so as not to further excite your dog or exasperate the situation. Give your dog plenty of time to recover making sure that it feels secure and safe. Call your veterinarian and get immediate medical assistance. If your dog suffers from an unexplainable collapse or if it is experiencing frequent collapses then it is possible that this is a symptom of a more serious illness. If this is the case with your dog you should seek immediate medical attention. If anyone else has witnessed your dog's collapse/s then take them with you to the veterinarian as they may be able to also give some clues to the vet that will help in the diagnosis and treatment of your dog. Some of the possible causes of collapse apart from epileptic fits are a lack of oxygen or vital nutrients to the brain. These could be caused by heart problems, a blockage in your dog's airway or metabolic problems.

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http://www.vetstreet.com/dogs/bee-stings-in-dogs
Just like in people, a bee sting can be serious; dogs are more likely to be stung because of their natural curiosity and playful nature. If a dog is stung by a bee or shows signs of a bee sting, remove the stinger if possible and seek professional help from your veterinarian. Bee stings can be successfully treated and sometimes prevented.

What You Need to Know
Bee stings can be a serious event and even life threatening in some cases. Dogs are at greater risk for bee stings than people, as they tend to chase or play with things that move. Dogs are likely to get stung in the mouth or on the nose, face, or feet by several different insects, including bees, wasps, and hornets.

If your dog suffers a bee sting, seek veterinary assistance. If you wait for an allergic reaction to occur you may already be too late; your dog could become very ill very quickly.

Signs of Bee Stings
Crying out, running in circles, salivating
Mild signs include: swelling of the area; scratching, rubbing, licking, or chewing at the sting
Severe signs include: profound swelling of the face, throat, or neck; hives, vomiting; difficulty breathing; collapse
Types of Bee Stings
A bee sting reaction may be as mild as slight burning or itching for several minutes
More venomous insect stings may cause profound swelling, pain, itching, and redness
In the most extreme situation a dog may have anaphylactic shock (a life-threatening, severe, allergic reaction) as a result of exposure to the insect venom. These signs can include difficulty breathing, collapse, and death.
What To Do
If your dog is stung by an insect, the most important thing to remember is to remain calm. If you think you can remove the stinger, doing so may reduce the amount of venom injected. You can try to remove the stinger by scraping a credit card across the dog’s skin to flick the stinger out. Do not try to remove the stinger by pinching/pulling it (as you might remove a splinter); this may actually increase the amount of venom that is injected.

Severe allergic reactions can happen very quickly and can become life threatening within minutes. If your pet suffers an insect sting, seek veterinary care as soon as possible. If you wait for signs of an allergic reaction to be apparent, you may be losing precious time. Although there is no antidote for bee stings, your veterinarian can assess your dog and administer medications to treat an allergic reaction. If you were not able to remove the stinger or it is in the mouth or is otherwise hard to reach, your veterinarian can assist with this. Medication to ease the pain and itching associated with stings can be administered by your veterinarian. In the case of a severe reaction or anaphylaxis, hospitalization for observation and more intensive care may be recommended.

Prevention
To minimize exposure to bee stings try to help your pet avoid flower beds, a favorite habitat of bees. Bees also may build nests in eaves of houses and in trees. Some hornets and wasps build their nests in the ground, so pay careful attention to where your dog may be digging when he is outside. It is always a good idea monitor your property for nests and have them removed when detected. Bees abound in the spring and summer and “bee proofing” your dog’s environment is big job. It is a good idea to have the phone numbers for your veterinarian and local veterinary emergency clinic on hand in case your dog is stung.