Did the meaning of dog comms ever get posited?

Had a look on urban dictionary (as [they] seem to like using it)(emphasis mine):

Dog

1. Your best friend

2. Your friend to lean on

3. Your companion

4. A big fluff ball of love

5. cant open its mouth to judge you

6. Protects you

7. the one you can cry on

8. Sit down and talk to him/her and she will listin

9. He/she loves you the most and would die for you

10. dog means love

Seems to fit.