Bees - Bumble Bees I think

Summer brought a host of honey bees and what I think are half grown Bumble Bees. The honey bees have moved on but I have an unbelievable number of the Bumble Bees.

I don't understand their behavior therefore I need input from you all if you have the time. Naturally they are all over the flower and veggie blooms, but they are also all over my outside dog run. The flooring is treated wood like a deck with a tarp covering. It is washed down several times a day because there are always bees on the edge of the watering pan, around the outside bottom of the pan or buzzing low to the floor. Now you're going to think I'm crazy but I don't think it's poop they are after, could it be urine, although the bees have mega access to water. The reason I say urine is our male Bully will 'mark' the water bowl as his own.

I have dog runs that are enclosed within a greenhouse with tarps over the top and they never go into it.

Another thing they are doing is crawling all over soiled puppy sheets that I hang on the line to hose off before putting into the washing machine.

How do I get rid of SOME of these bees? They are getting hard on my nerves system since I'm allergic to insect stings of all kinds. Just yesterday I pulled the puppy sheet off the line to take to the washing machine and felt a vibration from within, I dropped the sheets and ran into the house.

Help me if you can! I appreciate you taking the time to read this.

Judy