Hi!
I follow this fix 
https://discourse.pi-hole.net/t/install-a-more-recent-dnsmasq-on-raspbian-jessie/7306
and now I don't have errors...but I have not query to my pi-hole
https://c1.staticflickr.com/5/4770/40500563232_ecc0fa3078_b.jpg
This is the output of your commands :
root@UniFi-CloudKey:~# sudo service dnsmasq status
- dnsmasq.service - dnsmasq - A lightweight DHCP and caching DNS server
Loaded: loaded (/lib/systemd/system/dnsmasq.service; enabled)
Drop-In: /run/systemd/generator/dnsmasq.service.d
-50-dnsmasq-$named.conf, 50-insserv.conf-$named.conf Active: active (running) since Wed 2018-02-28 08:10:20 CET; 14h ago Process: 506 ExecStartPost=/etc/init.d/dnsmasq systemd-start-resolvconf (code=exited, status=0/SUCCESS) Process: 499 ExecStart=/etc/init.d/dnsmasq systemd-exec (code=exited, status=0/SUCCESS) Process: 426 ExecStartPre=/usr/sbin/dnsmasq --test (code=exited, status=0/SUCCESS) Main PID: 505 (dnsmasq) CGroup: /system.slice/dnsmasq.service-505 /usr/sbin/dnsmasq -x /run/dnsmasq/dnsmasq.pid -u dnsmasq -7 ...
root@UniFi-CloudKey:~# sudo service dnsmasq start
root@UniFi-CloudKey:~# sudo service dnsmasq status
- dnsmasq.service - dnsmasq - A lightweight DHCP and caching DNS server
Loaded: loaded (/lib/systemd/system/dnsmasq.service; enabled)
Drop-In: /run/systemd/generator/dnsmasq.service.d
-50-dnsmasq-$named.conf, 50-insserv.conf-$named.conf Active: active (running) since Wed 2018-02-28 08:10:20 CET; 14h ago Process: 506 ExecStartPost=/etc/init.d/dnsmasq systemd-start-resolvconf (code=exited, status=0/SUCCESS) Process: 499 ExecStart=/etc/init.d/dnsmasq systemd-exec (code=exited, status=0/SUCCESS) Process: 426 ExecStartPre=/usr/sbin/dnsmasq --test (code=exited, status=0/SUCCESS) Main PID: 505 (dnsmasq) CGroup: /system.slice/dnsmasq.service-505 /usr/sbin/dnsmasq -x /run/dnsmasq/dnsmasq.pid -u dnsmasq -7 /etc/dnsmasq.d,.dpkg-dist,.dpkg-old,.dpkg-new --local-service