If you harm or poison those dogs, Buddy, you can be charged with cruelty to animals per Animal Control Regulations:
§212.5 CRUELTY
A. It shall be a violation of these Regulations for any person to:
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(3) Administer poison to any animal, knowingly place, or leave any poisonous or other harmful substance with intent to injure or kill any animal other than vermin.
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(5) Cause, arrange, or participate in authorize these acts.
My suggestion is that you contact Tony Malaspina, Supervisor of Animal Control, at (301) 475-4200 Ext. 2115 on Monday after 8 am.