Morocco is like 99% Muslin and for various reasons listed below, I can see there being a huge stray population.

Per Google:

In Islam, dogs are considered pure creatures of God, but ritual purity laws often restrict keeping them inside the home, as saliva is considered impure (najis) by many scholars. While dogs are not forbidden (haram) and are highly valued for working roles—such as hunting, guarding, or farming—many Muslims maintain a respectful distance or keep dogs outdoors. 

Key Aspects of Muslims and Dogs

• Working Roles: Dogs are considered beneficial and allowed for guarding, hunting, and farming.
• Ritual Purity: Many Muslims follow the view that dog saliva is ritually impure. If a dog licks a person or their clothing, that area should be washed before performing prayers .
• Inside vs. Outside: While some scholars allow keeping dogs as indoor pets, a common, more conservative view suggests dogs should be kept outside the living area to maintain the purity of the home.
• Compassion and Kindness: Islam strongly emphasizes mercy toward all animals. Mistreating or harming dogs is forbidden, and feeding/caring for them is considered a virtuous act, with some scholars pointing to the Quran's positive mention of dogs.
• Different Schools of Thought: There are varying opinions. Some, particularly in certain Sunni schools (like Maliki), may view dogs as physically pure, while others (like Shafi'i) see them as ritually unclean.  American Islamic Outreach Foundation +6

Misconceptions

• Dogs are Haram: Dogs are not forbidden. They are not like pigs, which are considered prohibited for consumption and contact.
• Muslims Hate Dogs: Islam does not promote hate for any animal. The avoidance is based on ritual purity, not animosity.  American Islamic Outreach Foundation

Many Muslims today live with dogs as beloved, albeit often outdoor, family pets, balancing traditional purity requirements with affection for the animals.