My Dog May Have Been Bitten By A Brown Lacruse.

My dog may have been bitten by a brown lacruse. He has a small lision of tiny hole which started to bleed a little. It's not coming from rectum. I came in the house last note and there was this huge spider. He was fine the whole day. When I came home my husband said he was acting funny. Wouldn't even come out from under couch. He is only 2 years old.