Just be careful with -D, as it is relatively easy to accidentally make it possible for other computers to use your computer as a proxy too. By default, GatewayPorts in the sshd config is set to 'no', which will prevent this from happening. However, you or someone else may have set this to 'yes' at some point for some purpose. To be safe even in that case, you may want to use 'ssh -D127.0.0.1:4444' instead of just '-D4444'.

I have accidentally opened an internal network to the public this way. (Nothing bad happened.)