Answer: parasitic relationship
Explanation:
This type of relationship involves the parasite and the host.the parasite is the organism which lives in or on another organisms,called the host.
The parasite obtains food and shelter from the host and causes harm to the host.The host does not benefit rather it is harmed.
In this example,the dog is the host and the tick is the parasite.the tick has mouthparts modified for feeding from the host. It lives on the body of the dog , therefore it is an ectoparasite. The tick may cause disease and discomfort to the dog.
Plants can also be parasites;for example there are plants which lives on their host and gets nutrition from it while causing disease to it
