One of the good things about walking on Gran Canaria is that there are no poisonous or dangerous insects or animals on the island. There are no foxes nor any other large wild animals, but you will hear and see many lizards scurrying around.
In the North you may see herds of goats and sheep on the mountainsides, and cattle in enclosures. The largest wild mammal is the rabbit, you will see and hear dogs, most will be hunting dogs which are usually tied up or in an enclosure. The hunting season here in Gran Canaria is late August to late November, Sunday is the most popular day for the local hunters who shoot rabbit and partridge etc.
There are many interesting and endemic plants on the island, and also many interesting species of birds, including several birds of prey.
Mosquitoes and tics are not a major problem but they do exist, so a mosquito spray and an ‘after-bite’ pen are useful items to carry.
Be environmentally friendly, make sure that you take all of your rubbish home with you, including banana skins, orange peel, plastic bottles and bags etc.
If you are a smoker make 100% sure that your cigarette ends are properly extinguished. Forest and grass fires can be a problem here especially during the summer months.
If you have to pass through a gate make sure you secure it afterwards. The most important thing is to be careful about planning your hikes in Gran Canaria to get the maximum enjoyment from what I believe is a great hiking experience.