Fairfax County Animal Shelter has donation guidelines. See below for what you can donate to different organizations in Fairfax County.
Accepts:
bath towels
blankets/comforters/rugs
gently used dog toys
gently used ropes/collars/leashes
rope toys
rawhides
bowls
cat scratchers
cat trees
dog and cat beds
grooming items
Accepts:
bath towels
dog toys
dog and cat beds
bowls
pet medications
puppy pens/gates
martingale collars
newspaper
Accepts:
gently used leashes
recently opened food
bath towels
toys
crates and carriers
Accepts:
bath and hand towels
bowls (non-porcelain)
dog crates 36" or less
gently used dog toys
grooming items
gently used collars/leashes