How Can You Tell If Your Dog Was Bitten By A Spider?

House spider bites can cause local areas of irritation--red, raised bump(s) on the skin.  The poisonous spiders--like black widows and brown recluses--can cause severe redness leading to large areas of skin death.  If your dog is sensitive to spider bites it can have an anaphylactic reaction--this is severe and can be life threatening.  Signs include facial swelling, difficulty breathing, vomiting, and lethargy/depression. 
If you have any concerns that a spider has bitten your dog please have the dog examined by a veterinarian immediately.

Take your dog to your vet. They can tell you what bit her or him. That doesn't sound to good to me. Your best bet is to call your vet and get in as soon as you can. I hope your dog gets better soon. Scobby-doo.

You meant to say:  YOU people sound dumb. Do ANY of you know how to use proper english? The answers you gave this person WERE very ignorant.

1. You failed to use proper sentence structure and you had a large amount of misspelled words.

2. You failed to answer the question as well.

Only complete examination of the dog by a doctor can tell that who had bitten him/ her. You can't say anything by yourself.

What happened to your dog? I think my dog was bit by a spider also. Your story is very similar to what my dog is going through.